5. Refraction of Light at Plane Surfaces
1. “The process of changing speed at an interface when a light travel from one medium to another resulting in a change in direction is ______________.
2. The process of refraction involves bending of light ray except when it is ____________”.
3. If light ray enters from rarer medium to _________ then refracted ray moves towards the normal drawn at the interface of separation of two media.
4. When light travels from ____________ to rarer medium it bends away from normal.
5. When a light ray propagates through one medium to another medium is expressed in terms of _____________ (n).
6. Light travels in vacuum with a speed nearly equal to _____________.
7. Absolute refractive index, n =
8. ____________ gives us an idea of how fast or how slow light travels in a medium.
9. Refractive index depends on nature of material and ________ of light used.
10. Refractive index of second medium with respect to first medium is given by,
n21=
11. Relative refractive index, ( n21 ) =
12. Snell’s law is, n1 sin i = .
13. We observe that at a certain angle of incidence the refracted ray does not come out but grazes the interface separating air and glass. This angle of incidence is known as ____________(c).
14. When the angle of the incidence is greater than critical angle, the light ray gets reflected into the denser medium at the interface i.e., light never enters the rarer medium. This phenomenon is called _________________.
15. The formula for critical angle is, sin c = _______ (Or) ________
, 
16. _________ is an optical illusion where it appears that water has collected on the road at a distant place but when we get there, we don’t find any water.
17. If the temperature is decreases then the result density of air ________.
18. We know that refractive index of air increases with ________.
19. The shining of diamond is due to total ________ reflection.
20. The critical angle of a diamond is ________.
No comments