Question 1 :
The critical angle for total internal reflection for a substance is $45^{\circ}$. The polarizing angle for this substance is ($\tan 54^{\circ}44'=\sqrt{2}$) :<br/>
Question 2 :
When the light is incident at the polarizing angle on transparent medium, then the completely polarized light is
Question 4 :
Light waves exhibit polarization but sound waves do not exhibit polarization because they are not:<br/>
Question 5 :
A ray of light is incident on the surface of a glass plate at an angle of incidence equal to Brewster's angle $\phi$. If $\mu$ represents the refractive index of glass with respect to air, then the angle between the reflected and the refracted rays is
Question 8 :
A beam of light is incident on a liquid of refractive index 1.40. The reflected rays are completely polarized. The angle of refraction of the beam is ($\tan 54.5^{\circ}=1.4$):<br/>
Question 9 :
Consider the following statements A & B. Identify the correct choice in the given answers.<br/>(A) The refractive Index of the extra-ordinary ray depends on the angle of incidence in double refraction<br/>(B) The vibrations of light waves acquire onesidedness for both ordinary and extraordinary rays in double refraction<br/>
Question 10 :
Which of the following properties shows that light is a transverse wave?
Question 11 :
In Young's experiment of double slit, the number of times the intensity of the central bright band greater than the individual intensity of the interfering waves :<br/>
Question 12 :
Young's double-slit experiment is made in a liquid. The tenth bright fringe in liquid lies in screen where 6ht dark fringe lies in vacuum. The refractive index of the liquid is approximately<br>
Question 13 :
On introducing a transparent slab$(\mu)$, the central fringe shifts to the point originally occupied by the fifth bright fringe. The thickness of the slab is<br>
Question 14 :
An unpolarized beam of light is incidents on a group of four polarizing sheets, which are arranged in such a way, that of the characteristic direction of each polarizing sheet makes an angle of $30^0$ with that of the preceding sheet. The percentage of incident light transmitted by the first polarizered will be :
Question 15 :
Assertion: In Young's double-slit experiment, the two slits are at distance $d$ apart. Interference pattern is observed on a screen at distance $D$ from the slits. At a point on the screen which is directly opposite to one of the slits, a dark fringe is observed. Then, the wavelength of wave is proportional to the square of distance between the two slits.
Reason: For a dark fringe, intensity is zero.
Question 16 :
A biprism experiment was performed by using red light of wavelength $ 6500\mathring{A} $ and blue light of wavelength $ 5200\mathring{A}$. the value of n for which $ (n+1)^{th} $ blue bright band coincides with $ n^{th} $ red band is
Question 17 :
A source emitting wavelengths 480 nm and 600 nm is used in YDSE. The separation between the slits is 0.25 mm. The interference is observed 1.5 m away from the slits. The linear separation between first maxima of the two wavelengths is :<br/>
Question 18 :
A plane wave front of wave length $6000A$ is incident  upon a slit of $0.2mm$ width, which enables fraunhofer's diffraction pattern to be obtained on a screen $2m$ away. Width of the central maxima in mm will be 
Question 19 :
Young's experiment is performed in air and then performed in water, the fringe width
Question 20 :
Two Nicols is oriented with their principal planes making an angle of $60^0$. The percentage of incidents unpolarized light which passes through the system are <br>
Question 21 :
In the Young's double slit experiment, for which colour the fringe width is least
Question 22 :
The box of a pinhole camera of length L, has a hole of radius a. It is assumed that when the hole is illuminated by a parallel beam of light of wavelength $\lambda $ the spread of the spot (obtained on the opposite wall of the camera) is the sum of its geometrical spread and the spread due to diffraction. The spot would then have its minimum size say ${b }_{ min }$ when:<br>
Question 23 :
In a Youngs double slit experiment, let $A$ and $B$ be the two slits. A thin film of thickness $t$ and refractive index $\mu$ is placed in front of $A$. Let $\beta=$fringe with the central maximum will shift<br>
Question 26 :
Rays of light are entering from glass to glycerine. If refractive indexes of glass and glycerine are respectively 1.5 and 1.47, find the refractive index of glycerine with respect to glass.
Question 27 :
"Value of refractive index remains same for light rays with different wavelength and for a particular material"
Question 28 :
The power of a lens is negative. State whether it is convex or concave?<br/>
Question 29 :
Power of a lens is $-4$D and for second lens power is $+2$D; the total power of the couple.
Question 30 :
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 31 :
The beautiful natural phenomenon of the rainbow is acombination of which of the following different phenomena ?
Question 32 :
A thin convex lens of focal length $'f'$ made of crown glass is immersed in a liquid of refractive index $\mu_{1} (\mu_{1} > \mu_{2})$ where $\mu_{c}$ is the refractive index of the crown glass. The convex lens now is
Question 33 :
Change in the direction of light when it passes from one medium to another is called ............
Question 36 :
A ray of light suffers refraction throughequilateral prism. The deviation produced by theprism does not depend on the :
Question 37 :
Assertion: There exist two angles of incidence for the same magnitude of deviation (except minimum deviation) by a prism kept in the air. <br/>Reason: In a prism kept in the air, a ray is incident on the first surface and emerges out of the second surface. Now if another ray is incident on second. surface (of the prism) along the previous emergent ray, then this ray emerges out of the first surface along the previous incident ray. This principle is called the principle of reversibility of light.
Question 38 :
A converging lens of refractive index $1.5$ kept in a liquid medium having the same refractive index. What would be the focal length of the lens in this medium?<br/>
Question 39 :
If a drop of water is introduced between the glass plate and a convex lens in a Newton's ring system, the ring system
Question 41 :
An experiment is performed to find the refractiveindex of glass using a travelling microscope.In this experiment distances are measured by:<br>
Question 42 :
Two thin lenses of powers 2D and 3D are placed in contact. An object is placed at a distance of 30 cm from the combination. The distance (in cm) of the image from the combination is :<br/>
Question 43 :
A ray of light takes grazing incidence on the first face of a prism and the emergent ray is normal to the ${2}^{nd}$ face of the prism. If D is angle of deviation then the refracting angle of the prism is equal to<br/>
Question 44 :
Two lenses of power 6D and -2D are placed in contact. The power of the combination will be <br/>
Question 45 :
Magnification produced is +$\dfrac { 1 }{ 3 }$, then what kind of mirror it is?
Question 46 :
A diverging lens of focal length $f_1$ is placed in front of and coaxially with a concave mirror of focal length $f_2$. Their separation is d. A parallel beam of light incident on the lens returns as a parallel beam from the arrangement. Then<br>
Question 47 :
Two lenses one of focal length $20 cm$. (convex lens) and another of focal length $-15 cm$ (concave lens) are placed in contact. Identify the correct statement.
Question 48 :
Find out the correct option from the following.<br>(a) The magnification is positive for all virtual images and is negative for all real images.<br>(b) The magnification of concave lens and convex mirror is always positive where as the magnification of convex lens and concave mirror can be positive or negative depending on the position of the object before the lens.<br>
Question 49 :
If two lenses of power + 1.5 D and +1.0 D are placed in contact, then the effective power of combination will be :
Question 50 :
A concave mirror forms the image of an object on a screen. If the lower half of the mirror is covered with an opaque card, the effect would be to make the
Question 51 :
The power (in diopters) of an equiconvex lens with radii of curvature of $10cm$ and refractive index of $1.6$ is:
Question 52 :
The separation L between the objective ($f_{o}=$ 0.5 cm) and the eye piece($f_{e}=5 cm$)of a compound microscope is 7.0 cm. Where should a small object be placed so that the eye is least strained ?
Question 53 :
The radius of curvature of the convex surface of a planoconvexlens is 10 cm. What is the focal length of the planoconvex lens? ( Here$\mu$=1.5 )
Question 54 :
<br/>A convex lens made of glass of $\mu=1.5$ has a focal length $f$ in air. When it is completely immersed in a liquid of $\mu$ $=2$ its focal length and nature will be:<br/>
Question 55 :
A beaker containing liquid is placed on a table, underneath a microscope which can be moved along a vertical scale. The microscope is focused through the liquid on to a mark on the table when the reading on the scale is ${h}_{1}$. It is next focused on the upper surface of the liquid and the reading is ${h}_{2}$. More liquid is added and the observations are repeated, the corresponding readings are ${h}_{1}^{'}$ and ${h}_{2}^{'}$. The refractive index of the liquid is
Question 56 :
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 57 :
A circular area of radius $1\ cm$ is placed $2\ m$ away from a point source. The source emits light uniformly in all directions. The source is on the line of the normal from the centre of the area. $2\times10^{-3} $luminous flux is incident on the area. Find the total flux emitted by the source.
Question 58 :
A glass slab of thickness 18 cm and refractive index$\dfrac{3}{2}$ is placed on a printed matter. The normal shift of the printed matter is
