– A parallel beam of light of wavelength 500 nm is used for obtaining Newton’s rings in the reflected light. If the radius of curvature of the Plano-convex lens is 80 cm then the diameter of the 4th dark ring is ….
A. 2 cm
B. 4 cm
C. 6 cm
D. 8 cm
Answer:D
– A parallel beam of light of wavelength 500 nm is used for obtaining Newton’s rings in the reflected light. If the radius of curvature of the Plano-convex lens is 80 cm then the diameter of the 4th dark ring is ….
A. 2 cm B. 4 cm C. 6 cm D. 8 cm