A slit illuminated by monochromatic ligh...

A slit illuminated by monochromatic light is held 0.4 mm from the surface of a plane mirror. The fringe width in the interference pattern obtained with reflected and direct light is 0.25 mm. The screen is at 50 cm from the slit. The wavelength of light is

A

400 nm

B

450 nm

C

500 nm

D

550 nm.

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