Two thin lenses of power + 3.5 D and - 2.5 D are placed in contact. Find the power and focal length of the lens combination. - Zigya
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Two thin lenses of power + 3.5 D and - 2.5 D are placed in contact. Find the power and focal length of the lens combination.


Given,
Power of the lenses,
           P1 = +3.5 D,  P2 = -2.5 D

 Power of combination, P = P1+P2 = +3.5 -2.5 = +1.0 D 

Thus, focal length of combination of lens, f = 1P = 11.0 D = 1.0 m. 

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