a double convex lens of refractive index 1.5 has radii of 20 CM incident rays of light parallel to the axis will come to convert at a distance from the lens is
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Answer:
(u-1) R +
= (1.5-1)-+一1 120 20)
=0.5x- 10
20 f=20cmI
Thus, the incident rays will converge at a distance 20 c
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