The focal length of a simple convex lens used as a magnifier is 10 c m . For the image to be formed at a distance of distinct vision D = 25 c m , the object must be placed away from the lens nearly at a distance of

Question

The focal length of a simple convex lens used as a magnifier is 10 c m . For the image to be formed at a distance of distinct vision D = 25 c m , the object must be placed away from the lens nearly at a distance of, 5 c m, 7 c m, 8 c m, 16 c m

MARKS App · Accepted Answer

f = + 10 cm. v = 25 cm. 1 v - 1 u = 1 f 1 25 - 1 u = 1 10 10 - 25 250 = 1 u u = 16 cm

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