A single slit of width a is illuminated by a monochromatic light of wavelength 600 nm. The value of ‘a’ for which first minimum appears at θ = 30° on the screen will be:
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Question

A single slit of width a is illuminated by a monochromatic light of wavelength 600 nm. The value of ‘a’ for which first minimum appears at θ = 30° on the screen will be:

G1 Physics · Accepted Answer

For the first single-slit minimum, a sinθ=λ. With θ=30° and λ=600 nm, a=600 nm/0.5=1200 nm=1.2 μm. Option B.