1.

A parallel beam of light is made to fall on a concave mirror. An image is formed at a dmirror. What is the focal length and the radius of curvature of the mirror?

Answer»

1/v + 1/u = 1/f

so v = distance of object form mirror = infinity(i) u = distance of image from mirror = 7.5f = focal length of mirror = f1/i + 1/7.5 = 1/f0 + 1/7.5 = 1/ff = 7.5 cm



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