Question 1 :
A light ray is incident on a transparent medium of&#160;$\mu =$ 1.732 at the polarizing angle. The angle of&#160;refraction is :<br/>

Question 3 :
Three waves are given below.I. Sound wavesII. Visible light wavesIII. X-rays<br/>Which of the above waves cannot be polarised?

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 9 :
Consider the following statements A &amp; B and&#160;identify correct choice in the given answers<br/>(A) When light falls on two polaroid sheets having&#160;their axes mutually perpendicular, it is completely&#160;extinguished.<br/>(B) When polyvinyl alcohol is subjected to a large&#160;strain the molecules get oriented parallel to the&#160;direction of strain and material becomes double&#160;refractive.&#160;<br/>

Question 10 :
A light ray is incident on a glass slab it is partially reflected and partially transmitted. Then the reflected ray is<br>

Question 11 :
The critical angle for total internal reflection for a&#160;substance is $45^{\circ}$. The polarizing angle for this&#160;substance is ($\tan 54^{\circ}44'=\sqrt{2}$) :<br/>

Question 12 :
If $\mu _{O}$ and&#160; $\mu _{e}$ are the refractive indices of a double<br/>refracting crystal, then<br/>1)&#160; $\mu _{O}$ &lt; $\mu _{e}$ for quartz crystal<br/>2)&#160; ,$\mu _{O}$ &gt; $\mu _{e}$ for calacite crystal<br/><br/>

Question 13 :
Making a light wave vibrate in only one plane is known as :<br/>

Question 14 :
A calcite crystal is placed over a dot on a piece of paper and rotated. On seeing through the calcite, one will see :<br>

Question 15 :
Assertion: When light ray is incident at polarising angle on glass, reflected light is completely polarised. Reason: The intensity of light decreases in polarisation.

Question 16 :
Two coherent monochromatic light beams of intensities $l$ and $4l$ are superimposed. The maximum and minimum possible intensities in the resulting beam are:

Question 17 :
The maximum intensity in Young's double-slit experiment is ${I}_{0}$. Distance between the slits is $d=5\lambda$, where $\lambda$ is the wavelength of monochromatic light used in the experiment. What will be the intensity of light in front of one of the slits on a screen at a distance $D=10d$?<br>

Question 18 :
In an interference pattern of two waves fringe width is $\beta$. If the frequency of source is doubled then fringe width will become:-

Question 19 :
In Young&#8217;s experiment, the ratio of maximum and&#160;minimum intensities in the fringe system is 9:1.&#160;The ratio of the amplitudes of coherent sources is :<br/>

Question 20 :
Unpolarized light of intensity $32Wm^{-2}$ passes through three polarizes such that the transmission axis of the last polarizers is crossed with that of the first. The intensity of final emerging light is $3Wm^{-2}$.The intensity of light transmitted by the first polarizered will be&#160;

Question 21 :
Which of the following phenomena can be demonstratedby light. But not with sound waves in an air column ?

Question 22 :
Wavelength of red lightis $7.5 \times 10^{-5}\ cm$ and that of blue light is$5.0 \times 10^{-5}\ cm$. The value of $n$ for which $(n+1)$ thblue bright band coincides with $n^{th}$ red band, is:<br>

Question 23 :
Interference was observed in interference&#160;chamber when air is present. Now, the chamber is evacuated and if the same light is used, then for the same arrangement:

Question 24 :
In a Young's double slit experiment, $I_{0}$ is the&#160;intensity at the central maximum and $\beta $ is the&#160;fringe width. The intensity at a point P distant x&#160;from the centre will be:<br/>

Question 25 :
Fill in the blank.The phenomenon of polarization shows that light has ________ nature.

Question 26 :
Light of wave length 589.3 run is incident normally on a slit of width 0.01 mm. The angular width of the central diffraction maximum at a distance of 1 m from the slit, is.

Question 27 :
Intensity observed in an interference pattern $I = I_{0}\sin^{2}\theta$. At $\theta = 30^{\circ}$ intensity $I = 5\pm 0.002$. The percentage error in angle if $I_{0} = 20\dfrac {W}{m^{2}}$ is

Question 28 :
A parallel beam of white light is incident on a thin film of air of uniform thickness. Wavelengths $7200\mathring { A } $ and $5400\mathring { A } $ are observed to be missing from the spectrum of reflected light viewed normally. The other wavelength in the visible region missing in the reflected spectrum is<br>

Question 29 :
In YDSE, the amplitude of intensity variation of the two sources is found to be $5%$ of the average intensity. The ratio of the intensities of two interfering sources is

Question 30 :
In Young's double slit experiment, the fringes are displaced by a distance $x$ when a glass plate of refractive index $1.5$ is introduced in the path of one of the beams. When this plate os replaced by another plate of the same thickness, the shift of fringes is $(3/2)x$. The refractive index of the second plate is