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Dispersion through Prisms

In bi-prism e...

Question

In bi-prism experiment, fringes are obtained by white light sources. The fringe nearest to the central fringe will be

A

yellow

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B

green

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C

violet

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D

red

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Solution

The correct option is B violet
Position of first fringe is given by $y_{1} = \frac{D λ}{d}$
Hence the nearest fringe is one with least wavelength, which is violet.

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