The radii of curvature of a convex lens is 20 cm and the refractive index of the material of the lens is 3/2. (i) caculate its focal length
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I don't know your answer because I am in class 6th you can ask with your other friends or teacher ok
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given r=20 CM
as we know that
R = 2f
so , 20 = 2 f
=>20/2=f
=>10=f
I hope this will help you
nikki200414:
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