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A broad sources of light of wavelength 6...

A broad sources of light of wavelength `680nm`illuminated normally two glass plates.`120nm`long that meet at one end and are separated by a wire`0.048mm`in diameter at the other end,Find the number of bright fringes formed over the `120nm`distance.

Text Solution

Verified by Experts

The correct Answer is:
`141`
Darke fringe interference pattern is due to interference between ligth reflected from lower slab and upper slab.

For dark to dark or bright to bright to wedge size will increase by `(lambda)/(2)`.For N bright frings
`n.(lambda)/(2)=0.48 rArr n=(0.96)/(680xx10^(-6)) =(96000)/(680)=141`
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