what is the focal length of a combination of a convex lens of focal length 30 cm and the concave lens of focal length 20cm is contact is the system converging or diverging lens ignore thickness of the lens
a 60cm
b -60cm
c 20cm
d 10cm
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10 cm is the answer of rhis question
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Power of a lens is reciprocal of its focal length. It is given by : So, the power of a concave lens is (-5
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