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Find the focal length of a lens of power -2.0 D. What type of lens is this?

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asked Jan 19, 2018 in Physics by Kundan kumar (49,132 points) ● 34 ● 384 ● 1026

Find the focal length of a lens of power -2.0 D. What type of lens is this?

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answered Jan 19, 2018 by Vikash Kumar (144,729 points) ● 8 ● 11 ● 21
selected Jan 19, 2018 by Kundan kumar
 
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Given Power P =- 2.0D
If f is the focal length of lens, then P =1/f gives

f=1/P=1/-2.0 m=-50cm
Negative sign shows that lens is concave. Thus focal length oflens is 50 cm and it is concave lens.

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