A student has to project a three times magnified image of a candle flame on a wall .name the type of the lens (converging or diverging) required for the purpose. if the candle flame is at a distance of 6 metre from the wall ,find the focal length of the lens.
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the type of the lens converging and for forming this image the object should be kept between the centre of curvature and focal length of the convex lens and the image will form beyond the centre of curvature behind the mirror and for finding focal length use this formula 1/f =1/v- 1/u and here f is focal length, v is image distance and u is object distance
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1)it is converging lens
2)focal length =+
2)focal length =+
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