Question

The convex surface of radius 200 cm ofa plano convex lens rests on a concave spherical surface of radius 400
cm and Newton's rings are viewed with reflected light of wavelength 600 nm. Calculate the diameter of the 8th
bright ring
(c) 0.85 cm
(a) 0.25 cm
(b) 0.45 cm
(d) 0.35 cm​

Answer 1

Answer :

0.85 cm.

Explanation :

The thickness of the air-film at B Fig. 12.12 iswhere ρ = OD R1 = Radius of curvature of OB and R2 = Radius of curvature of OC. Thus the condition of the mth bright fringe isIn the present problem m = 8 λ = 600 nm n = 1 R1 = 200 cm R2 = 400 cm. We find 2 ρ8 = 0.85 cm.

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Answer 2

Explanation:

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