For total internal reflection to take place, the angle of incidence i and the refractive index of the medium must satisfy the inequality ____.
The reason for shining of air bubble in water is ____.
diffraction of light
dispersion of light
scattering of light
total internal reflection of light
With respect to air critical angle in a medium for light of red colour is (. Other facts remaining same, critical angle for light of yellow colour] is ____.
A ray of light traveling in a transparent medium falls on a surface separating the medium from air at an angle of incidence of 45°. The ray undergoes total internal reflection. If n is the refractive index of the medium with respect to air, select the possible value (s) of n from the following ____.
1.3
1.4
1.5
1.6
When a ray of light emerges from a block of glass, the critical angle is ____.
equal to the angle of reflection
the angle between the refracted ray and the normal
the angle of incidence for which the refracted ray travels along the glass-air boundary
the angle of incidence
Relation between critical angles of water and glass is ____.
Cw > Cg
Cw < Cg
Cw = Cg
Cw = Cg = 0
If critical angle for a material to air is 30o, the refractive index of the material is ____.
1.0
1.5
2.0
2.5
The refractive index of water is 1.33. The direction in which a man under water should look to see the setting sun is ____.
49o to the horizontal
90o with the vertical
49o to the vertical
Along the horizontal
A light ray from air is incident (as shown in figure) at one end of a glass fiber (refractive index ( = 1.5) making an incidence angle of 60o on the lateral surface, so that it undergoes a total internal reflection. How much time would it take to traverse the straight fiber of length 1 km ____.
3.33 ( s
6.67 ( s
5.77 ( s
3.85 ( s
Light wave enters from medium 1 to medium 2. Its velocity in 2nd medium is double from 1st. For total internal reflection the angle of incidence must be greater than ____.
30o
60 o
45 o
90 o