Question

When does a convex lens appears to behave as a diverging lens?

Answer 1

when light is passed through it from infinity

Answer 2

Hey mate..

Here's your answer..

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That's why the rarer medium convex lens placed in dancer medium behaves like as concave lens and Concave lens behaves like Convex lens. Because for those medium the relative value of refractive index is changed according to the situation.

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Attached a pic for better understanding..

HOPE IT HELPS...

@Rêyaañ11