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At what distance from a concave lens of focal length 20 cm a 6 cm tall object be placed so as to obtain its image at 15 cm from the lens?

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asked Mar 17, 2018 in Science by paayal (26,720 points) ● 4 ● 6 ● 54
edited Mar 24, 2018 by Vikash Kumar

At what distance from a concave lens of focal length 20 cm a 6 cm tall object be placed so as to obtain its image at 15 cm from the lens? Also calculate the size of the image formed.

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answered Mar 17, 2018 by sanjaydas (61,430 points) ● 5 ● 7 ● 7
selected Mar 24, 2018 by Vikash Kumar
 
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Object should be placed at 60 cm from the lens.

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