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
A. 100 cm
B. 25 cm
C. 50 cm
D. 30.3 cm
Answer: 50 cm
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