Question 1 :
When an object is at infinity from a concave mirror, the image formed is
Question 2 :
Which of the following is not an application of convex lens?
Question 3 :
In passing through a boundary, refraction will not take place if
Question 4 :
The image formed by the given convex mirror when it is inside focal distance is:
Question 5 :
Two thin lenses of focal lengths $f_{1} and f_{2}$ are in contact and coaxial. The power of the combination is :<br/>
Question 6 :
<br>Which is the human organ which behaves like an optical instrument having lens and a screen?
Question 7 :
What type of mirror can be used alone to obtain a real image of a real object?
Question 8 :
Which of the below is one of the laws of refraction?<br>
Question 11 :
A ray of light travels from air to glass at an angle of incidence of $37^{\circ}$, the angle of refraction is $24^{\circ}$. What is the refractive index of glass?<br/>(Given: $\sin 37^{\circ} = 0.60, \sin 24^{\circ} = 0.40)$
Question 12 :
Where should the object be placed in front of a concave mirror so that the image formed is of the same size as the object?
Question 17 :
To observe the hydra bud clearly. Raju should see it first under the low power lens and then under the high power lens in order to see 
Question 19 :
In case of a virtual and erect image, the magnification created by the mirror is
Question 20 :
Lens A produces a magnification of -0.8 whereas lens B produces a magnification of +0.8. Which one of the following applies to lenses A and B?
Question 21 :
A convex lens is used to form real image of an object on a screen. It is observed that even when the positions of the object and that screen are fixed are two position of the lens to form real images. If the heights of the images are $4\ cm$ and $9\ cm$ respectively the height of the object is
Question 22 :
A light ray travels at some angle (not head on) from water in a rectangular aquarium, through the glass side, and out into air . The indices if refraction for water, glass, and air are 1.33, about 1.6, and 1.0, respectively.<br/>Rank the material;s according to the angles of refraction  made by the light ray with the normal in each, greatest first.
Question 24 :
Find the power (with sign) of a concave lens of focal length $20cm$.<br/>
Question 26 :
The focal length of a combination of lenses formed with lenses having powers of $+2.50\ D$ and $-3.75\ D$ will be
Question 27 :
Object when placed at ________ in front of concave mirror magnification of -1 is obtained.
Question 28 :
A plane glass plate is placed over a various coloured letters (violet, green, yellow, red). The letter which appears to raised more
Question 29 :
The sum of the reciprocals of object distance and image distance is equal to the __________ of a mirror.<br>
Question 31 :
State the direction of incident ray which after reflection from a spherical mirror retraces its path:
Question 32 :
A concave lens forms the image of an object which is :<br><br>
Question 34 :
A ray of light travelling in air strikes the surface of glass at angle of $45^{\circ}$. The angle of refraction in the glass will be :
Question 35 :
Choose the correct statement(s) related to the motion of object and its image in the case of  mirrors.
Question 37 :
A convex lens makes a real image $4\ cm$ long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on the screen which is $16\ cm$ tall. The length of the object must be
Question 38 :
The focal length of convex lens is 30 cm and the size of image is quarter of the object, then the object distance is:-
Question 39 :
The focal length of a convex mirror is $20\ cm$ its radius of curvature will be
Question 40 :
The focal length of a concave lens is $2m$. Then the power of the lens is:<br/>
Question 41 :
A converging lens has a focal length of $50 cm$. The power of the lens is
Question 42 :
When the face is very close to the spoon the image formed by the outside bulged part?
Question 43 :
A ray of light incident at the optical centre of lens, passes undeviated after refraction.<br>
Question 44 :
A short sighted person can see distinctly only those objects which lie between $10cm$ and $100cm$ from him, The power of the spectacle lens required to see a distance object is
Question 45 :
Which of the following term is not associated with a lens?
Question 46 :
The heat of sun focussed by a convex lens on a piece of paper is capable of
Question 47 :
If the magnification of a body of size 1 m is 2, what is the size of the image?
Question 50 :
Ray optics fail when the size of the obstacle is :
Question 52 :
A convex lens of focal length 80 cm and concave lens of focal length 50 cm are combined together. What will be their resultant power?<br>
Question 53 :
A object is placed at 30 cm on the principle axis of the convex lens from the lens and an image is formed 60 cm from the lens. If focal length of the lens is 20 cm then calculate the magnification.
Question 54 :
The far point of a myopia eye is $1.5 m$. To correct this defect of the eye, the power of lens is _______.
Question 55 :
A ray of light is incident at an angle i on a glass slab of refractive index $\mu$. The angle between reflected and refracted light is $90^o$. Then the relationship between i and $\mu$ is.<br>
Question 56 :
A short linear object of length $L$ lies on the axis of a spherical mirror of focal length $f$ at a distance $u$ from the mirror. Its image has an axial length $L$ equal to :
Question 57 :
A plate of thickness t made of a material of refractive index $\mu$ is placed in front of one of the slits in a double slit experiment. What should be the minimum thickness t which will make the intensity at the center of the fringe pattern zero?
Question 59 :
A square card of side length 1 mm is being seen through a magnifying lens of focal length 10 cm. The card is placed at a distance of 9 cm from the lens. The apparent area of the card through the lens is
Question 60 :
A red colour in air has wavelength 760 nm when light passes through water of refractive index $\left( n=\frac { 4 }{ 3 } \right) $, wavelength becomes 570 nm.(wavelength of yellow colour in air is 570 nm).Then colour of red light in water is
Question 61 :
The far point of a myopic person is 40 cm. To see the distantobjects clearly, the focal length and the power of the lensused should be:
Question 62 :
Assertion: Power of the lens is larger if its focal length is smaller.
Reason: Power of the lens measures the ability to converge or diverge the refracted rays.
Question 63 :
Assertion: If light enters from medium-1 into medium-2 and bends towards the normal, its wavelength in medium-2 is smaller than its wavelength in medium-1
Reason: According to Cauchy's relation, $\mu = A + \dfrac{B}{\lambda^2}$
Question 65 :
A thin plane membrane separates hydrogen at27$^o$C from hydrogen at 127$^o$C, both being at thesame pressure. A plane sound wave enters from the cooler to the hotter side. If the angle of incidenceon the membrane is 30$^o$C, then the angle ofrefraction is <br>
Question 66 :
A vertical ray of light strikes the horizontal surfaceof water.What is the angle of refraction?
Question 67 :
A double concave thin lens made out of glass ($\mu = 1.5 $) have radii of curvature 500 cm. This lens is used to rectify the defect in vision of a person. The far point of the person will be at
Question 68 :
Ratio of the sine of angle of incidence to the sine of angle of reflection is:
Question 69 :
For the same statement as above, the ratio of the two image sizes for these two positions of the lens is<br>
Question 70 :
A ray of light strikes a glass plate at an angle of ${60}^{o}$. If the reflected and refracted rays are perpendicular to each other, the refractive index of glass is
Question 71 :
The distance between an object and the screen is $100$cm. A lens produces an image on the screen when placed at either of two positions $40$cm apart. The power of the lens is approximately.
Question 72 :
Rays of light fall on a glass plate of refractive index $=\sqrt{3}$. If the angle between refracted ray and reflected ray is $90$, the angle of incidence is :
Question 73 :
A slide projector gives a magnification $10.$ If a slide of dimensions $3$ cm $\times$ $2$ cm is projected on the screen the area of image screen is
Question 74 :
The distance of the sun form the earth is $1.5\times 10^{11}$ and its diameter is $1.40\times 10^9m.$ The diameter of the image of the sun formed by a lens of focal length $1m$ is nearly:
Question 75 :
The apparent flattening of the sun at sunset and sunrise is due to
Question 76 :
A ray of light in a liquid of refractive index 1.4, approaches the boundary surface between the liquid and air at an angle of incidence whose sine is 0.8. Which of the following statements is correct about the behaviour of the light
Question 77 :
The magnification of the image when an object is placed at a distance x from the principle focus of a mirror of focal length f is?
Question 78 :
The relation between $u, v$ ( u is the object distance and v is the image distance )  and f for mirror is given by:<br/>
Question 79 :
The focal length of the objective of a telescope is $60$ cm. To obtain a magnification of $20$ for the relaxed eye, the length of telescope should be
Question 80 :
White light is incident normally on a glass slab. Inside the glass slab,
Question 81 :
The image distance of an object placed $10\ cm%$ in front of a thin lens of focal length $5cm$ is
Question 82 :
An object is placed at a distance $2 f$ from the pole of a convex mirror of focal length $f$ . The linear magnification is:<br/>
Question 83 :
An object is kept at a distance of $20 cm$from a converging lens of focal length$10 cm$. What will be the magnification?
Question 85 :
A large rectangular glass slab has two sets of parallel faces. Light ray is incident on the glass slab and trace of light ray is drawn. Now glass slab is rotated by $90^o$ such that light ray now passes to second set of parallel faces. What will be the effect on trace of light?
Question 86 :
An object placed at a distance of <b>16 cm</b> from first principal focus of convex lens, produces a real image at a distance of <b>36 cm </b>from its second principal focus. Then the focal length of the lens is :
Question 87 :
An object $5$ cm tall is placed $1$ m from a concavespherical mirror which has a radius of curvatureof $20$ cm. The size of the image is:<br>
Question 90 :
The refractive index of water with respect to air is1.33. The refractive index of air with respect towater will be
Question 91 :
When an object is moved along the principal axis of a thin converging lens of focal length 12 cm, two images, three times the size of the object are obtained when the object is at $x_1$ and $x_2$ distance from the lens. Which one of the following could be the value of the ratio $\frac {x_1}{x_2}$ ?
Question 92 :
A glass slab is placed in the path of a beam of convergent light; the point of convergence of light
Question 93 :
Magnification produced by spherical lens is $+2.5$. What is the nature of image?
Question 94 :
In an optical instrument a convex lens of focal length 20 cm is used and kept in contact with a concave lens of focal length 40 cm, What is the power of this combination?
Question 95 :
A ray of light is incident from one medium $(\mu = 1.5)$ into another medium. If the angle of incidence and refraction are, respectively,$60$and$45$, thenwhatwill be the refractive index of the denser medium?
Question 96 :
A beam of light converges towards a point O, behind a convex mirror of focal length 20 cm. Find the magnification and nature of the image when point O is 30 cm behind the mirror.
Question 97 :
A concave mirror is made from a hollow sphere of radius of curvature 30 cm.  If an object of height 2 cm is placed at 10 cm from the pole of the mirror, determine the size of the image :
Question 98 :
When an object is placed on the principal axis of a convex lens at two different positions, it produces the images with magnification +2 and -4 respectively. How many times more away from the lens the image will be formed in the second position as compared to the first position?<br>
Question 99 :
Calculate the focal length of a convex lens of power 2D.<br/>
Question 100 :
A lens forms a diminished and erect image of an object. The magnification is $\frac {1}{4}$. Find ratio of distance between object and focus and focus and image<br>
Question 101 :
The magnitude of focal length of a concave mirror is $f$. An object is placed at a distance $x$ from the focus and forms a real image. The magnification is:<br/>
Question 102 :
An object is placed at $30$ cm distance from a concave mirror of focal length $20$ cm, then nature, magnification of the image will be:
Question 103 :
The final image in an astronomical telescope is _______ the original object . Fill in the gap.<br/>
Question 104 :
The distance between an object and its doubly magnified image by a concave mirror is: [ Assume $f$ = focal length]
Question 105 :
The focal length of a thin biconvex lens is 20 cm. when an object is moved from a distance of 25 cm in front of it to 50 cm, the magnification of its image changes from $m_{25}$ to $m_{50}$. The ratio of $m_{25}$ to $m_{50}$ is :
Question 106 :
What happens when a ray of light is made to fall on a mirror along the normal?<br/>
Question 107 :
A point object is placed on the principal axis of the convex lens of focal length 20cm at a distance 40 cm to the left on it. The diameter of the lens is 10cm. If the eye is placed 60cm to the right of the lens at a distance h below the principal axis, then max value of 'h' to see the image is
Question 108 :
When a light of wavelength $4000$ $\displaystyle \overset { \circ  }{ A } $ in vacuum travels through the same thickness in diamond and water separately, the difference in the number of waves is $200$. Find the thickness, if refractive indices of diamond and water are $\displaystyle \frac { 5 }{ 2 } $ and $\displaystyle \frac { 4 }{ 3 } $ respectively.
Question 109 :
A spherical convex surface separates object and image space of refractive index $1$ and $4/3$ respectively. If radius of curvature of the surface s $0.1\ m$, its power is
Question 110 :
A small object of linear dimension $x$ lies on the axis of an optical mirror of local length $f$ at a distance $a$ from mirror. The linear dimension of image:
Question 111 :
An image of a bright square is obtained on a screen with the aid of a convergent lens. The distance between the square and the lens is $40\ cm$. The area of the image is nine times larger than that of the square. Select the correct statement(s).
Question 112 :
A short linear object of length $b$ lies along the axis of a concave mirror of focal length $f$ at a distance $u$ from the pole of the mirror. The size of the image is approximately equal to:<br/>
Question 113 :
The angle between the incident ray and the normal is called ________.<br>
Question 114 :
The glancing angle of incidence is $10^{\circ}$. What will be the glancing angle of reflection?
Question 115 :
Let the x-z plane be the boundary between two transparent media. Medium $1$ in $z\ge 0$ has a refractive index of $\sqrt { 2 } $ and medium $2$ with $z< 0$ has refractive index of $\sqrt { 3 } $. A ray of light in medium $1$ given by the vector $\vec { A } =6\sqrt { 3 } \hat { i } +8\sqrt { 3 } \hat { j } -10\hat { k } $ is incident on the plane of separation. The angle of refraction in medium $2$ is:
Question 116 :
A $2.5$ dioptre lens forms a virtual image which is $4$ times the object placed perpendicularly on the lens. Then the required distance of the object from the lens is .
Question 117 :
The diameter of the reflecting surface of spherical mirror is called ..............
Question 118 :
Three convex lenses are available having focal lengths of $4 cm, 40 cm$ and $4 m$ respectively. Which one could be used as magnifying glass?
Question 119 :
A symmetric double convex lens is cut in two equal parts by a plane containing the principal axis. If the power of the original lens was 4 D, the power of a divided lens will be
Question 120 :
In vacuum, to travel distance 'd', light takes time 't' and in medium to travel distance $'5d'$, it takes time 'T'. The critical angle of the medium is.<br>
Question 121 :
A $4.5 cm$ needle is placed $12 cm$ away from a convex mirror of focal length $15 cm$. Find the location of the image and the magnification.
Question 122 :
The image obtained while finding the focal length of convex lens is...................
Question 123 :
A ray of light going towards the centre of curvature of a convex mirror ............
Question 124 :
A water film is formed on a glass-block. A light ray is incident on water film from air at an angle of$\displaystyle { 60 }^{ \circ }$ with the normal. The angle of incidence on glass slab is<br>($\displaystyle { \mu }_{ g } = 1.5,{ \mu }_{ w } = \frac { 4 }{ 3 }$)
Question 125 :
A concave shaving mirror has a radius of curvature of 35.0 cm. It is positioned so that the (upright) image of a mans face is 2.50 times the size of the face. How far is the mirror from the face?
Question 126 :
Two thin lenses of power $+3.5D, -2D$ are placed in contact. Find the power of lens combination.
Question 127 :
The reflecting surface is given by $y = \dfrac{10L}{\pi} \sin \dfrac{\pi x}{5L}$. The co-ordinates of the point where a horizontal ray becomes vertical after reflection is:
Question 128 :
A short linear object of length $b$ lies along the axis of a concave mirror of focal length $f$ at a distance u from the pole of the mirror. The size of the image is approximately equal to :<br>
Question 129 :
Air has refractive index $1.0003$. Find the thickness of air column which will contain one more wavelength of yellow light of $6000$ $A^0$ than in same thickness of vacuum.
Question 131 :
Image of an object at infinity is formed by a convex lens of focal length $30 \ cm$ such that the size of the image is $2 \ cm$. If a concave lens of focal length $20\  cm$ is placed in between the convex lens and the image, at a distance $26\  cm$ from the convex lens, size of the new image is:
Question 132 : In the table below, column I lists various mirrors  and lenses and column II their uses, qualities or properties.<br/><table class="wysiwyg-table"><tbody><tr><td>column  I</td><td>Column II</td></tr><tr><td>I. Plane mirror</td><td>A. Feels thinner in the middle.</td></tr><tr><td>II. Concave mirror</td><td>B. Always forms virtual image.</td></tr><tr><td>III. Convex mirror</td><td>C. Always forms virtual image of smaller size.</td></tr><tr><td>IV. Concave lens </td><td>D. Is used by dentists to examine teeth.</td></tr><tr><td>V. Convex lens</td><td>E. Can be used as reading glass.<br/></td></tr></tbody></table>The correct matching is:
Question 133 :
A flim projector magnifies a flim of area $100 $ square centimeter on screen. If linear magnification is $4$ then area of magnified image on screen will be-
Question 134 :
Aconvex lens of radii of curvature 20 cm and 30 cm respectively. It is silveredat the surface which has smaller radius of curvature. Then it will behave as $(\mu_g\, = \, 1.5)$
