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NCERT Class XII Chapter
Wave Optics
Questions With Solutions

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Question : 16
Total: 21
In double-slit experiment using light of wavelength 600 nm, the angular width of a fringe formed on a distant screen is 0.1°. What is the spacing between the two slits?
Solution:  
Angular width, θ =
λ
d
0.1 =
0.1
180
 π rad =
6×10−7
d
∴ d =
6×10−7×180
0.1×π
 = 3.44 × 10−4 m
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