ICSE Class 10 Physics 2023 Solved Paper
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Question : 48
Total: 76
A ray of light is incident at 45 ∘
(1) Name the phenomenon exhibited by the ray of light when it enters and emerges out of the prism.
(2) State the cause of the above phenomenon mentioned by you.
(1) Name the phenomenon exhibited by the ray of light when it enters and emerges out of the prism.
(2) State the cause of the above phenomenon mentioned by you.
Solution:
(1) The phenomenon exhibited by the ray of light when it enters the prism is dispersion.
The phenomenon exhibited by the rays of light when they emerge.out of the prism is refraction.
Thus, at the first surface of prism dispersion takes place whereas at the second surface only refraction takes place (from glass to air).
(2) The cause of dispersion of incident white light is that light of different wavelength travel with different speeds in a medium. When white light enters the first surface of the prism, light of different colours due to their different speeds in glass, get deviated through different angles towards the base of the prism.
On the second surface refraction takes place from glass to air and different colours get deviated through different angles due to their different angles of incidence at this surface.
The phenomenon exhibited by the rays of light when they emerge.out of the prism is refraction.
Thus, at the first surface of prism dispersion takes place whereas at the second surface only refraction takes place (from glass to air).
(2) The cause of dispersion of incident white light is that light of different wavelength travel with different speeds in a medium. When white light enters the first surface of the prism, light of different colours due to their different speeds in glass, get deviated through different angles towards the base of the prism.
On the second surface refraction takes place from glass to air and different colours get deviated through different angles due to their different angles of incidence at this surface.
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