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प्रश्न
The refractive index of air with respect to glass is defined: as gµa = sin i/sin r
If r = 90°, what is the corresponding angle i called?
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उत्तर
Given: gμa = `Sin "i"/Sin "r"`
If r = 90°
then aμg = `(Sin90°)/Sin "i"=1/Sin "i"`
The corresponding angle i is called the critical angle for the given pair of media.
संबंधित प्रश्न
The speed of light in glass is 2 × 105 km/s. What is the refractive index of glass?
Name the colour of white light which is deviated the most on passing through a prism.
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
Four students showed the following traces of the path of a ray of light passing through a rectangular glass slab.
The trace most likely to be correct is that of student
(A) I
(B) II
(C) III
(D) IV
Rahim recorded the following sets of observations while tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence.
|
S. No. |
Angle of incidence |
Angle of refraction |
Angle of emergence |
|
I |
45° |
41° |
45° |
|
II |
40° |
38° |
38° |
|
III |
45° |
41° |
40° |
|
IV |
41° |
45° |
41° |
The correct observation is recorded at serial number:
(1) I
(2) II
(3) III
(4) IV
Draw a ray diagram showing the lateral displacement of a ray of light when it passes through a parallel sided glass slab.
Name the phenomenon responsible in the following case:
Twinkling of stars
A ray of light moves from a rare medium to a dense medium as shown in the diagram below. Write down the number of the ray which represents the partially reflected ray.
