The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. If the image is three times the size of the flame and the distance between lens and image is $80 c m$ , at what distance has the candle been placed from the lens? What is the nature of the image and the lens?

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Solution

$u = - \frac{80}{3 c m} .$ Image is real and inverted. The lens is convex.

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The image of a candle flame formed by a lens is obtained on a screen placed on the other side of the lens. If the image is three times the size of the flame and the distance between lens and image is 80 cm, at what distance should the candle be placed from the lens? What is the nature of the image at a distance of 80 cm and the lens?

Question 35
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u=−803cm. Image is real and inverted. The lens is convex.

$u = - \frac{80}{3 c m} .$ Image is real and inverted. The lens is convex.