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Discussion

Preparation for NTSE / NSEJS / KVPY - Grade 10
(5)

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An eye specialist prescribes spectacles having a combination of convex lens of focal length 50 cm in contact with a concave lens of focal length 25 cm. The power of this combination of lenses (in dioptre) is

 
-2.5
-1.5
-0.04
-2.0

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Peppy Shubhi

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