Questions  

A slit of width a is illuminated by white light. The first minimum for red light 
(  λ= 6500 Å) will fall at  θ = 30° when a will be

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By Expert Faculty of Sri Chaitanya
a
3250 Å
b
6.5 × 10-4cm
c
1.3 micron
d
2.6 × 10-4 cm
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detailed solution

Correct option is C

sinθ=λa12=6500×10−10aa=13000×10−10=13×10−7m=1.3μm

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