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An object kept at 60 cm from a lens give...

An object kept at 60 cm from a lens gives a virtual image at 20 cm in front of the lens. What is the focal length of the lens ?
It it a converging lens or diverging lens ? Also find the magnification produced.

Text Solution

Verified by Experts

` 1/f = 1/v - 1/u = 1/ ( - 20 cm ) - 1/( - 60 cm)`
` = - (1/(20 cm) - 1/( 60 cm) ) = - ((3-1)/ ( 60 cm)) = - 2/( 60 cm) = - 1/( 30 cm)`
The focal length of the lnes, f = - 30 cm. As f is negative , it is a diverging lens.
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