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Find the thickness of a plate which will...

Find the thickness of a plate which will produce a change in opticle path equal to half the wavelength `lambda` of the light passing through it normally. The refractive index of the plate is `mu`.

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The correct Answer is:
`(lambda)/(2(mu-1))`
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SL ARORA-WAVE OPTICS-Based on Intensity Distribution in interference pattern
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