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Two lenses of power+5D and -12D …

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Two lenses of power+5D and -12D are in contact find there combined focal length

Posted by Adrika Singh 3 years ago

CBSE > Class 10 > Science

1 answers

Preeti Dabral 3 years ago

Total power = P₁+P₂=5-12=-7 D

Total focal length F=100/P=100/-7= -14.28 cm

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