A glass wedge of angle 0.01 radian is illuminated by monochromatic light of wavelength 6000 Å falling normally on it. At what distance from the edge of wedge will the 10 th fringe be observed by reflected light is ….. × 10 –1 cm.
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Ans. 3
Sol. θ = 0.01 radian
n = 10
λ = 6000 × 10 –8 cm
Δ x = 2t = n λ
θ = 
t = θ x
2 θ x = n λ
x = 
= 3 × 10 –1 cm
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