A thin converging lens of power 6D and a thin diverging lens of power 2D are in contact. What is the focal length of the combination?
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A thin converging lens of power 6D and a thin diverging lens of power 2D are in contact. What is the focal length of the combination?
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TOPIC :- LENS
Concept
SOLUTIONS
power of converging lens = 6 D
power of diverging lens = -2 D.
Equivalent power = 6 - 2 = 4 D.
Hence, focal length = 1/P = 1/4 = 0.25 m
Hence, focal length of the lens is 0.25 m.