Ronit uses a lens of focal length +40 cm and his brother Shobhit uses a lens of focal length - Science - The Human Eye and the Colourful World

Question

Ronit uses a lens of focal length +40 cm and his brother Shobhit
uses a lens of focal length −40 cm What is the nature of the
lens and its power used by each of them?

Debalina Deb · Accepted Answer

Solution
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Ronit uses a lens of focal length +40 cm and his brother Shobhit uses a lens of focal length −40 cm. What is the nature of the lens and its power used by each of them?