Questions
Light falls normally on a slit of width 0.3 mm. A convex lens of focal length 40 cm collects the rays at its focal plane. The distance of the first dark band from the central line of the screen is 0.8 mm. The wave length of light is
detailed solution
Correct option is C
(3)sinθ1=λa=ydf⇒ λ=a.ydf=0.3 × 0.8400 mm=6000 AoTalk to our academic expert!
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