Question 1 :
A fish is looking at a $1.0m$ high plant of the edge of the pond. Will the plant appear shorter or taller than its actual height, to the fish

Question 2 :
Power of a lens is $+ 2.0 \mathrm { D }$then it's focal length is

Question 4 :
A parallel beam of white light is incident normally on a water film $1.0 \times 10^{-4}$ cm thick. Find the wavelength in the visible range $(400\ nm-700\ nm)$ which are strongly transmitted by the film. Refractive index of water $= 1.33$.

Question 5 :
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 7 :
We want a mirror that will make an object look larger. What combination of image and object distances (from the mirror) will accomplish this?

Question 8 :
A light ray travels at some angle (not head on) from water in a rectangular aquarium, through the glass side, and out into the air. The indices of refraction for water, glass, and air are $1.33$, about $1.6$, and $1.0$, respectively.<br>Rank the materials according to the angles made by the light ray with the normal in each, greatest first

Question 9 :
A beam of monochromatic blue light of wavelength $4200\mathring { A } $ in air travels in water of refractive index ${ 4 }/{ 3 }$. Its wavelength in water will be

Question 10 :
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 11 :
The distance between an object and its doubly magnified image by a concave mirror is: [ Assume $f$ = focal length]

Question 12 :
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 13 :
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 14 :
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 15 :
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 16 :
A ray of light going towards the centre of curvature of a convex mirror ............

Question 18 :
The diameter of the reflecting surface of spherical mirror is called ..............

Question 19 :
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 $z&lt; 0$ 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 20 :
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 21 :
The image obtained while finding the focal length of convex lens is...................

Question 22 :
In the table below, column I lists various mirrors &#160;and lenses and column II their uses, qualities or properties.<br/><table class="wysiwyg-table"><tbody><tr><td>column &#160;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&#160;</td><td>D.&#160;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 23 :
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 24 :
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 25 :
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 26 :
The glancing angle of incidence is $10^{\circ}$. What will be the glancing angle of reflection?

Question 27 :
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 28 :
What happens when a ray of light is made to fall on a mirror along the normal?<br/>

Question 29 :
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 30 :
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.