if you are give three circular piece of glass how will you identify which one of them is a concave lens in which one of the convex lens and with which one just a piece of glass

if you are give three circular piece of glass how will you identify wh

1.	if you are give three circular piece of glass how will you identify which one of them is a concave lens in which one of the convex lens and with which one just a piece of glass
Answer» HING the pieces of glass you can identify the piece of glass#for concave lensu will feel a DEPRESSION in the centre and edges will be thick#for convex lenstapering at the ENDS and thick at the centre #for NORMAL piece of glassthickness REMAINS the same at every point

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if you are give three circular piece of glass how will you identify which one of them is a concave lens in which one of the convex lens and with which one just a piece of glass

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