A thin convex lens of focal length 20 cm is kept in contact with a thin concave lens of focal length 15 cm. Find the focal length and the nature of the combination
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1/f =1/f1 +1/de
1/f = 1/20+1/15
1/f = 7/70
f= 10cm
1/f = 1/20+1/15
1/f = 7/70
f= 10cm
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