Question Text
Question 1 :
The angle of incidence at which reflected light is totally polarised for reflection from air to glass (refractive index $n$) is :<br>
Question 2 :
If the red light is replaced by blue light illuminating the object in a microscope the resolving power of the microscope
Question 3 :
A biprism arrangement in air is immersed completely in a liquid. The fringe width
Question 4 :
The average path difference between two waves coming from third and fifth Fresnel zones of a wave front at the centre of the screen is :<br/>
Question 5 :
In optical instruments, the lenses are used to form images by :
Question 6 :
A light ray is incident on a glass slab it is partially reflected and partially transmitted. Then the reflected ray is<br>
Question 7 :
A ray of light in air is incident on a glass plate at polarising angle of incidence. It suffers a deviation of $22^\circ$ on entering glass. The angle of polarization is :<br/>
Question 8 :
At the polarising angle $(\theta _{B})$, angle of refraction is given by : <br/>
Question 9 :
The least resolvable angle by a telescope using objective of aperture 5 m is nearly ($\lambda = 4000A^{\circ}$)<br/>