Home Physics Wave Optics General A long narrow horizontal slit lies 1 mm abov…
Physics Wave Optics General MCQ (Single Correct)

A long narrow horizontal slit lies 1 mm above a plane mirror. The interference pattern produced by the slit and its image is viewed on a screen Σ distant 1m from the slit. The wavelength of light is 600 nm. Then the distance of the first maxima above the mirror is equal to (d << D):

A
0.30 mm
B
0.15 mm
C
60 mm
D
7.5 mm

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Text Solution

Verified by Experts
The correct answer is:
B

Point O is a minima Hence the first maxima will be at y = from O.

⇒ y = = = 0.15 mm.

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