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An object kept at a distance of 60cm from a lens gives a virtual image at a distance of 20cm over the same side

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asked Jan 20, 2018 in Physics by Kundan kumar (49,132 points) ● 34 ● 384 ● 1027

An object kept at a distance of 60cm from a lens gives a virtual image at a distance of 20cm over the same side of the lens. What is the focal length of the lens? Is the lens converging or diverging?

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answered Jan 20, 2018 by Vikash Kumar (144,729 points) ● 8 ● 11 ● 21
selected Jan 20, 2018 by Kundan kumar
 
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The focal length of the lens is 30cm. The -ve sign shows that the lens is diverging.

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