Question 3 :
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 5 :
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 6 :
When a compact disc is illuminated by small source of white light, coloured bands are observed. This is due to

Question 7 :
Onintroducing a thin film in the path of one of the two interfering beam, thecentral fringe will shift by one fringe width. If $\mu = 1.5$, the thicknessof the film is (wavelength of monochromatic light is $\lambda$)

Question 8 :
In YDSE distance between slits and screen is $1.5m$. When the light of&#160;wavelength $500nm$ is used then $2^{nd}$ bright fringe is obtained on screen at a distance of $10mm$ from the central bright fringe. What will be the shift in the 2nd bright fringe of the light of wavelength $550nm$ is used?

Question 9 :
The diameter of the objective of a telescope is $a$,&#160;its magnifying power is $m$ and wavelength of light&#160;$\lambda&#160;$ . The resolving power of the telescope is :<br/>

Question 10 :
When an unpolarized light of intensity $I_{0}$ isincident on a polarizing sheet, the intensity ofthe light which does not get transmitted, is :<br>

Question 11 :
In Youngs double slit experiment, the fringes are displaced by a distance $x$ when a glass plate of one refractive index $1.5$ is introduced in the path of one of the beams. When this plate in replaced by another plate of the same thickness, the shift of fringes is $(3/2)x$. The refractive index of the second plate is

Question 12 :
In Young's double-slit experiment, the slit separation is $0.5mm$ and the screen is $0.5m$ away from the slit. For a monochromatic light of wavelength $500nm$, the distance of 3rd maxima from the 2nd minima on the other side of central maxima is<br>

Question 13 :
In a double slit interference experiment, the fringe width obtained with a light of wavelength $5900\overset{o}{A}$ was $1.2\ mm$ for parallel narrow slits placed $2\ mm$ apart. In this arrangement, if the salt separation is increased by one-and-half times the previous value, then the fringe width is:<br/>