1. The main cause for the brilliance of diamond is______
2. The angle formed by the refracted ray and the normal at the surface is called
3. Raju is doing an experiment with the glass slab. He focussed the light towards the glass at angle of 30⁰. What would be the angle of emergence.
4. In which the velocity of light is high
5. The blue colour of the sky is due to
6. Refraction of light is due to change in ________ of light.
7. A transparent medium of lower refractive index is also called
8. Angle of incidence (i) , angle of refraction ( r) , Then refractive index (n)
9. In the given figure, among the two media A and B, which one is dencer ?
10. The absolute refractive index of water and glass respectively are 4/3 and 3/2 , then the relative index of glass with respect to water is ______
11. The refractive index of two media A and B are 1.33 and 1.54 . The velocity of light is least in
12. Angle of refraction in the given picture is
13. Suppose you are inside the water in a swimming pool. Your friend is standing on the edge of the swimming pool, your friend appears to be
14. The basic principle behind working of optical fibre is
15. STATEMENT A: Light changes its direction when it is reflected.
STATEMENT B: Light changes its speed when it travels in different media.
16. At critical angle of ncidence , the angle of refraction is
17. The material used to make the optical fibre
18. If critical angle is 30⁰, then refractive index of the medium is _______
19. The speed of light in Vacuum is
20. The refractive index of diamond is
