Click to Chat
1800-1023-196
+91-120-4616500
CART 0
Use Coupon: CART20 and get 20% off on all online Study Material
Welcome User
OR
LOGIN
Complete Your Registration (Step 2 of 2 )
A convex lens of diameter 8.0 cm is used to focus a parallel beam of light of wavelength 620 nm. If the light be focused at a distance of 20 cm from the lens, what would be the radius of the central bright spot formed?
Sol. . For first minimum diffraction, b sin θ = λ Here, θ = 30°, b = 5 cm ⇒ λ = 5 * sin 30° = 5/2 = 2.5 cm.
Post Question
Dear , Preparing for entrance exams? Register yourself for the free demo class from askiitians.
points won -