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Q.

A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are placed in contact with each other. The power of lens combination is [[1]]D.


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Detailed Solution

The power of lens combination is -6 D.
The formula of power of lens is given as
Power of lens=1Focal length of lens(in m)
Power of convex lens = +10025                                          = +4 D
Power of concave lens = -10010                                            = -10 D
Power of lens combination = 4 - 10 D
                                                   = - 6 D
 
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