Question

An object is placed 50 cm from a lens produces a virtual image at a distance of 10cm in front of the lens. Draw a diagram show the formation of image. Calculate focal length of the lens and magnification produced​

Answer 1

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Given :-

Distance of object from the mirror u=−50 cm

Distance of image from the mirror v=−10 cm

Solution :-

For lens, we know

1/f = 1/v - 1/u

☞ 1/f = 1/-10 - 1/-50

☞ f = - 12.5 cm

f = −12.5cm

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m = v / u

☞ m = - 10 / - 50

☞ m = + 1 / 5

☞ m = + 0.2

m = + 0.2