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Question
When a ray of white light is incident obliquely on the first surface of a prism, then ______.
Options
Red colour is deviated most.
Green colour is deviated most.
Yellow colour is deviated most.
Violet colour is deviated most.
Solution
When a ray of white light is incident obliquely on the first surface of a prism, then violet colour is deviated most.
Explanation:
Shorter wave lengths (like violet) deviate more in a prism due to increased refraction, whereas longer wavelengths (like red) deviate least. The deviation of light in a prism is dependent on its wavelength.
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