If a student wants to project the image of a candle flame on a wall using a lens, then at what distance $d$ in terms of focal length $f$ of the convex lens should the candle be placed to get a real, magnified, and erect image?

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2 f > d < f

f < d < 2 f

Both of the above

None of the above

answer is B.

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Detailed Solution

The candle should be placed at

f < d < 2 f

.
The student should place the candle between

f

and

2 f

in order to get a magnified image. It is so because the converging or convex lens forms a real, erect, and enlarged image of the object when it is placed in this arrangement.
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