A parallel beam of light is made to fall on a concave lense. an image appears tobe formed at a distance of 7.5 cm from the lense . what are the focal length and the radius of curvature of the lense?
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The answer is the two which and it is very easy thanks
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1/v + 1/u = 1/f
Explanation:
so v = distance of object from mirror = infinity
u = distance of image from mirror = 7.5
f = focus length of mirror = f
1/i + 1/7.5 = 1/f
0+1/7.5 = 1/f
f= 7.5 answer
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