Advertisements
Advertisements
Question
A glass slab is placed over a page on which the word VIBGYOR is printed with each letter in its corresponding colour.
- Will the image of all the letters be in the same place?
- If not, the state which letter will be raised to the maximum. Give a reason for your answer.
Advertisements
Solution
- The image of all the letters of the word VIBGYOR in their corresponding colours will not be at the same place.
- The letter of violet colour (i.e. V) appears to be raised maximum, while the letter of red colour (i.e. R) appears to be raised minimum.
Since apparent depth = `"real depth"/"refractive index"` and the refractive index of glass is most for the violet light while least for the red light, therefore the apparent depth is least for violet and most for the red.
RELATED QUESTIONS
What is a spectrum?
A light ray in passing from water to a medium
(a) speeds up
(b) slows down. In each case, give one example of the medium.
How is the angle of emergence related to the angle of incidence when prism is in the position of minimum deviation? Illustrate your answer with help of a labelled diagram using an equilateral prism?
Select from the following the best experimental set-up for tracing the path of a ray of light through a glass slab:
(A) I
(B) II
(C) III
(D) IV
A total reflecting equilateral prism can be used to deviate a ray of light through:
A ray of light passes from water to air. How does the speed of light change?
The refractive index of air with respect to glass is defined: as gµa = sin i/sin r
Write down a similar expression for aµg in terms of angle i and r.
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).
Which colour of white light travels fastest in any medium except air?
