2019 · Q68
When a beam of white light is allowed to fall on a prism, the maximum deviation of the emerging light occurs for
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- Ared light
- Bviolet light
- Cyellow light
- Dblue light
Explanation
In a prism, deviation increases as wavelength decreases, because the refractive index is higher for shorter wavelengths. Violet light (about 400 nm) therefore deviates most and red least. Hence B.