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A convex lens produces an inverted image...

A convex lens produces an inverted image of size 1.4cm The size of object is 0.7cm. If the object is at distance 30 cm from the lens. Calculate focal length of the lens

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The correct Answer is:
f = 20 cm
Using Thin lens Formula, 1/f = 1/do +1 /di m = hi/ho ; m = -di/do
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