Two lenses of power +3 and -1 diopters are placed in contact. The focal length of the combined lens is
Two lenses of power +3 and -1 diopters are placed in contact. The focal length of the combined lens is

Q. Two lenses of power +3 and -1 diopters are placed in contact. The focal length of the combined lens is

A.            100 cm

B.            25 cm

C.            50 cm

D.            30.3 cm

 Answer: 50 cm
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