1. When a light wave travels from one medium to another medium one of the following Physical quantities does not change.
Ans: frequency
2. The distance between two consecutive points of same phase is
Ans: wavelength
3. Huygens' wave theory cannot explain
Ans: polarisation
4. Relation between maximum value of electric vector (E0) and maximum value of magnetic vector (B0) is
Ans: B0 = E0/C
5. The Velocity of electromagnetic waves in vacuum is
Ans: 3 × 108 m/s
6. Maxwell's electro magnetic wave theory cannot explain
Ans: photoelectric effect
is equal to
Ans: Velocity of light in vacuum
is equal to
Ans: Velocity of light in medium
9. The refractive index of a medium is equal to
Ans: 
10. If the refractive index of water is 1.33, the velocity of light in water is
Ans: 2.25 × 108 m/s
11. The refractive index of glass with respect to water is 
The refractive index of water with respect to glass is...
Ans: 
12. The ratio of velocities of light waves of wavelengths 4000 Aº and 5000 Aº is
Ans: 1 : 1
13. The refractive index of water with respect to glass is . If the velocity of light in water is 2.25 × 108 m/s, the velocity of light in glass is
Ans: 2.0 × 108 m/s
14. If the wave length of light in vacuum is 6000 Aº its wavelength in glass is (Refractive index of glass = 1.5)
Ans: 4000 Aº
15. The refractive index of glass with respect to water is 9/8. If the wavelength of light in glass is 4000 Aº, its wavelength in water is
Ans: 4500 Aº
16. If C is the critical angle of the material of a prism with respect to air, the maximum value of the refracting angle of the prism kept in air to get an emergent ray is
Ans: 2C
17. Light passes through an equilateral prism with its incident and emergent rays situated symmetrically with respect to the base of prism when the angle of incidence is 45 The angle of deviation is
Ans: 30°
18. Light incident normally on an equilateral glass prism of refractive index 1.5 undergoes total internal reflection. The angle of deviation is
Ans: 60o
19. A prism of refracting angle 2° is made of a material of refractive index 1.5. If the prism is kept in water of refractive index 4/3, its angle of minimum deviation is
Ans: 
20. A prism of refracting angle 4° is made of a material of refractive index 1.5. If the prism is kept in air its angle of minimum deviation is
Ans: 2°
21. What is the ratio of the angle of minimum deviation of a thin glass prism (µ = 1.5) if it is kept in air and then immersed in a liquid (µ = 1.3)?
Ans: 6.5 : 2
22. When a prism is in minimum deviation-
Ans: Angle of incidence is equal to angle of emergence
23. Critical angle is minimum for which colour of light?
Ans: Violet
24. The critical angle for glasswater interface if the refractive index of glass is 3/2 and that of water is 4/3 will be
25. The critical angle of a denser medium of refractive index 
for its interface with air is
Ans: 45 degrees
26. The velocities of light in two media are 1.25 x 108 m/s and 2.25 x 108 m/s. What is the critical angle at their interface?
Ans: sin-1 
27. When a bubble of air rises through a column of water placed in birght light, the bubble appears to be shining due to
Ans: total internal reflection
28. A crack in a pane of glass when see obliquely appears
Ans: Silvery
29. A parallel sided glass slab is of thickness t. It is made of a material of refractive index µ. When light is incident on one of the parallel faces at an angle of incidence i, it emerges from the other parallel face. The distance travelled by the light in the glass slab is
Ans: 
