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Questions
What do you understand by the term spectrum?
Explain the term spectrum.
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Solution
The colour band obtained on a screen on passing white light through a prism is called the spectrum. It consists of seven constituent colours in the order of VIBGYOR (Violet, Indigo, Blue, Green, Yellow, Orange, and Red).
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RELATED QUESTIONS
In the following diagram, the path of a ray of light passing through a glass prism is shown:

In this diagram the angle of incidence, the angle of emergence and the angle of deviation respectively are (select the correct option):
(A) X, R and T
(B) Y, Q and T
(C) X, Q and P
(D) Y, Q and P
Study the following figure in which a student has marked the angle of incidence (∠i), angle of refraction (∠r), angle of emergence (∠e), angle of prism (∠A) and the angle of deviation (∠D). The correctly marked angles are

(a) ∠A and ∠i
(b) ∠A, ∠i and ∠r
(c) ∠A, ∠i, ∠e and ∠D
(d) ∠A, ∠i, ∠r and ∠D
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(a) green
(b) violet
(c) indigo
(d) yellow
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What is Newton’s disc?
A ray of light is incident at 45° on an equilateral prism in the diagram below.

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