A parallel beam of light is made to fall on a concave lens. An image appears to
be formed at a distance of 7.5 cm from the lens. What are the focal length and the
radius of curvature of the lens?
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Answer:
focal length = 7.5 cm
Radius of curvature = 2*7.5 = 15 cm.
A parallel beam of light is made to fall on a concave lens then It passes through focus
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