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प्रश्न
The speed of light in glass is 2 × 105 km/s. What is the refractive index of glass?
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उत्तर
Given:
Speed of light in glass = 2 x 105 km/s = 2 x 108 m/s
Refractive index of glass is
`mu_"glass" = (3 xx 10^8)/(2xx10^8) = 1.5`
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संबंधित प्रश्न
If the speed of light in vacuum is 3 × 108 ms−1, find the speed of light in a medium of absolute refractive index 1.5.
Name a prism required for obtaining a spectrum of Ultraviolet light.
A ray of light passes from glass into air. The angle of refraction will be:
(a) equal to the angle of incidence
(b) greater than the angle of incidence
(c) smaller than the angle of incidence
(d) 45°
Fill in the blanks to complete the following sentence
The refractive index of glass with respect to air is 3/2. The refractive index of air with respect to glass will be ……………….
The critical angle for glass-air is 45° for the light of yellow colour. State whether it will be less than, equal to, or more than 45° for (i) ref light, (ii) blue light?
While tracing the path of a ray of light passing through a rectangular glass slab a student tabulated his observations as given below:
|
S.NO. |
∠i |
∠r |
∠e |
|
I |
60° |
40° |
61° |
|
II |
50° |
36° |
51° |
|
III |
40° |
28° |
39° |
|
IV |
30° |
20° |
31° |
The correct observations is:
(A) I
(B) II
(C) III
(D) IV
Which colour of light travels fastest in any medium except air?
How is the refractive index of a medium related to its real depth and apparent depth?
Explain briefly what causes the twinkling of stars at night.
