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  • A convex lens and a concave lens, each having same focal length of are put in contact t

A convex lens and a concave lens, each having same focal length of \mathrm{25\ cm} are put in contact to form a combination of lenses. The power in diopters of the combination is:

Option: 1

Zero


Option: 2

25


Option: 3

50


Option: 4

Infinite 


Answers (1)

best_answer

Focal length of convex lens, \mathrm{f_{1}=25\ cm}
Focal length of convex lens, \mathrm{f_{2}=25\ cm}
Power of combination in diopters,
 \mathrm{P=P_1+P_2=\frac{100}{f_1}+\frac{100}{f_2}=\frac{100}{25}-\frac{100}{25}=0}

Posted by

Ajit Kumar Dubey

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