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Refractive Index

The refractiv...

Question

The refractive index of a given piece of transparent quartz is the greatest for:

A

red light

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B

violet light

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C

green light

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D

yellow light

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Solution

The correct option is B violet light
Refractive index of a material depends on the wavelength of light used. Refractive index increases with decreasing wavelength of light. Of the given lights, violet has highest frequency hence least wavelength. So, the refractive index of the transparent quartz will be greatest for violet light which has least wavelength.

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