Two lenses of power 6D and -2D are combined to form a single lens. The focal length of this lens will be
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Answer:
25 cm
Explanation:
Given : P1=6 D P2=−2D
Power of combined lens P=P1+P2=6−2=4D
Focal length = 1/p = 1/4 = 0.25m or 25cm
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