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

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Solution

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

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

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Question 4

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