When a ray of white light is incident obliquely on the first surface of a prism, then ______.

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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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