Study the given diagram and answer the following questions.
A very thin narrow beam of white light is made incident on three glass objects shown
below.
Comment on the nature and behavior of the emergent beam in all the three cases.
a) There is similarity between two of the emergent beams. Identify the two.
b) When light enters from air to glass, the angles of incidence and refraction in air and
glass are 45° 30°, respectively. Find the refractive index of glass. (Given
thatsin 45° =
1
2
; sin 30° =
1
2
)
c) Why does light change its path as the medium changes during the transit?
d) What is the unit of refractive index?
Answers
Answer:
In (i) emergent beam is white and laterally displaced. In (ii) emergent beam js a spectrum of seven colours bent in different angles. In (iii) emergent beam from the second prism is white only. The similarity between (i) and (iii) as both emergent rays are white in colour. Read more on Sarthaks.com - https://www.sarthaks.com/166415/a-very-thin-narrow-beam-of-white-light-is-made-incident-on-three-glass-objects-shown-below
Answer:
In (i) emergent beam is white and laterally displaced. In (ii) emergent beam js a spectrum of seven colours bent in different angles. In (iii) emergent beam from the second prism is white only. The similarity between (i) and (iii) as both emergent rays are white in colour. Read more on Sarthaks.com - https://www.sarthaks.com/166415/a-very-thin-narrow-beam-of-white-light-is-made-incident-on-three-glass-objects-shown-below