If a student wants to project the image of a candle flame on a wall using a lens, then the student must use a ____ lens.

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Detailed Solution

If a student wants to project the image of a candle flame on a wall using a lens, then the student must use a Convex lens.
We know that only a real image can be obtained on the screen. So the lens used by the student must be convex only, as the real image can be obtained by a convex lens only. A concave lens always produces a virtual image.

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