Q1. A convex lens of focal length 30cm is combined with a concave lens of focal length 30cm. What is the power of the combined lens?(1)
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power of convex lens=1/30
power of concave lens=1/30
power of combination =1/30+1/30
=2/30
=1/15
=0.06D
power of concave lens=1/30
power of combination =1/30+1/30
=2/30
=1/15
=0.06D
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