Light of wavelength 546 nm is used to illuminate normally two glass plates 24.6

Question

Light of wavelength 546 nm is used to illuminate normally two glass plates 24.6 cm in length that touch at one end and are separated at the other by a wire of radius 0.03 mm. How many bright fringes appear along the total length of the plates.

___________

A plano-convex glass lens of radius of curvature 2.9 m rests on an optically flat glass plate. The arrangement is illuminated from above with monochromatic light of 546-nm wavelength. The indexes of refraction of the lens and plate are 1.6. Determine the radii of the first and second bright fringes in the reflected light.

First bright fringe : _________ m

second bright fringe : ________ m

Explanation / Answer

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