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. How will you differentiate between a convex and a concave lens by looking at (i) a distant object and (ii) a printed page

How will you differentiate between a convex and a concave lens by looking at (i) a distant object and (ii) a printed page?

 

Best Answer

(i) On seeing a distant object through the lens, if its inverted image is seen, the lens is convex and if the upright image is seen, the lens is concave.

(ii) On keeping the lens near a printed page, if letters appear magnified, the lens is convex and if the letters appear diminished, the lens is concave.

 

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