Question

Two identical thin len
other on same optical axis as shown in the figure,
The right surface of the right lens is silvered local
length of each lense is 20 cm and radius of the
silvered surface is 20 cm. the focal length of the
combined system is
(1) -10 cm
(2) - 5 cm
(3) - 2 cm
(4) - 1.33 cm​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

four identical thin lenses are kept on beside the other on the same optical Axis as shown in the figure the right surface of right most lens is silvered focal length of each lens is 20 cm and radius of the Silver the surface is 20cm the focal length of the combined systems