Question

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Answer 1

the object is placed in the centre of curvature (2f1). show that the image also has the same size.

now we know that 2f1 from the pole is -50cm...and f=-25cm.

therefore power of lens is -4D.,.. by the formula you know which is power of lens

Answer 2

Hlooo....
the object is placed in the centre of curvature (2f1). show that the image also has the same size.

now we know that 2f1 from the pole is -50cm...and f=-25cm.

therefore power of lens is -4D.,..
Hope it helps.....