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Three lenses have a combined power of 2.7D . If the powers of two lenses are 2.5D and 1.7D respectively, find the focal length of the third lens 

(1) −66.66cm 

(2) −6.666cm 

(3) −66.66m 

(4) −6.666m

1 Answer

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Best answer

(1) −66.66cm

Power of combination :

P = P1 + P2 + P3 

2.7 = 2.5 + 1.7 + P3

P8 = -1.5 D

∴ F8 = 100 / P8 = 10.0 / -1.5

= - 66.66 cm

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