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Questions
For which colour of white light the refractive index of a transparent medium the most? Give the reason for your answer.
Solution
The refractive index of a transparent medium is least for the red light.
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RELATED QUESTIONS
Select from the following the best experimental setup for tracing the path of a ray of light passing through a rectangular glass slab.
(a) P
(b) Q
(c) R
(d) S
With the help of diagram of the principal section of a prism, indicate its refracting surfaces, refracting edge and base.
In fig 4.18, name the ray which represents the correct path of light while emerging out through a glass block.
The refractive index of glass is 1.5. From a point P inside a glass block, draw rays PA, PB and PC incident on the glass air surface at an angle of incidence 30°, 42° and 60° respectively.
- In the diagram show the approximate direction of these rays as they emerge out of the block.
- What is the angle of refraction for the ray PB?
`("Take" sin 42° =2/3)`
After tracing the path of rays of light through a glass slab for three different angles of incidence, a student measured the corresponding values angle of refraction r and angle of emergence e and recorded them in the table given below:
|
S. No. |
∠i |
∠i |
∠e |
|
I |
30° |
20° |
31° |
|
II |
40° |
25° |
40° |
|
III |
50° |
31° |
49° |
The correct observations are:
(A) I and II
(B) II and III
(C) I and III
(D) I, II and III
Fill in the blank to complete the following sentence:
When light travels from a rarer to a denser medium, it bends ...........
What is the refractive index of water
State the relation between the refractive index μ and the velocity of light (vm) in that medium.
Trace a ray of light incident at 30° on a surface if travelling from air to glass. What is the angle of refraction in this case? (R.I. for glass = 3/2).
