8 A convex lens of focal length f 10 cm is cut through a dimeteral...

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8 A convex lens of focal length f 10 cm is cut through a dimeteral plane into two semicircular halves In doing so glass of 0 5 mm thickness is lost The two halves are then joined together This lens is placed symmetrically 5 cm in front of a slit which is illuminated with light of wavelength 5000 A A screen is placed on the other side of the lens at a distance of 90 cm from the lens perpendicular to the optical axis of the lens Find total number of bright fringes formed

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