13. 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) -66.66 cm (2)-6.666 cm (3) -66.66 m (4) -6.666 m
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Answer:(1) -66.66 cm
Explanation:power of third lens = 2.7-4.2=-1.5D
We know p=1/f(in metres)
So, -1.5=1/f (in metres)
f =1/ - 1.5=-0.6666m
=-66.66 cm
Answered by
1
Explanation:
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