Two lenses of focal lengths 20cm and -40cm are kept in contact with each other. The power of equivalent lens will be
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20cm=0.2m
-40cm=-0.4m
power of 1st lens=1/0.2=0.5
power of 2nd lens=-0.25
total power=0.5 + (-0.25)
=0.25
-40cm=-0.4m
power of 1st lens=1/0.2=0.5
power of 2nd lens=-0.25
total power=0.5 + (-0.25)
=0.25
lalit985:
wrong
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