How will you differentiate between a convex and a concave lens by looking at (i) a distant object, (ii) a printed page ?[2 marks]

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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. [1 mark]

(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.
[1 mark]

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