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Rules of Ray Diagram for Representation of Image

why does a co...

Question

why does a concave lens behave like a convex mirror and why does a convex lens behave like a concave mirror?

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Solution

That is because of their construction concave lens and convex mirror both converge light where as other two do the opposite. By the way this is only true when the refractive index of the material of the lens is higher than the surrounding, other wise lens will behave in opposite way.

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When and how does a convex lens behave like a concave lens?

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Q. A plano-convex lens when silvered on the plane side behaves like a concave mirror of focal length

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