The filament of a lamp is 80 cm from a s...

The filament of a lamp is 80 cm from a screen and a converging lens forms an image of it on a screen, magnified three times. Find the distance of the lens from the filament and the focal length of the lens.

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20 cm, `+15` cm

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LAKHMIR SINGH & MANJIT KAUR-REFRACTION OF LIGHT-Exercise

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