A slit of width 'a' is illuminated by white light. For what value of ' – McqOptions

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1.	A slit of width 'a' is illuminated by white light. For what value of 'a' will the first minimum for red light of wavelength 650 nm be at θ = 15° ? (Given sin 15° = 0.2588)
A.	5 μm
B.	2.5 μm
C.	10 μm
D.	4.5 μm
Answer» C. 10 μm

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