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Two thin lenses, one of focal length +60 cm and the other of focal length -20 cm are kept in contact. Their combined focal length is

May 2, 2022
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Two thin lenses, one of focal length +60 cm and the other of focal length

Q. Two thin lenses, one of focal length +60 cm and the other of focal length -20 cm are kept in contact. Their combined focal length is

A.            Minus 30 cm

B.            Plus 30 cm

C.            Minus 15 cm

D.            Plus 30 cm

Answer: Minus 30 cm

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