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Important Terms Related to Spherical Lenses

A student obt...

Question

A student obtained a sharp image of a lighted candle on a screen using a convex lens. Now he wants to focus a distant lamp on a far away electric pole. In which direction should the lens be moved for this purpose with respect to the screen, to get a sharp image on the screen? Justify your answer.

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Solution

The lens should be moved towards the screen so as to get a clear image and sharp image. Because when we move the lens towards the screen then the object moves farther away from the lens. Hence we can get take the object as at infinity so when light rays come from the infinity the convex lens converges the rays of light and focuses the image and hence we are able to get the image on the screen that is the distant lamp.

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Q. A student obtained a sharp image of a lighted candle on the screen using a convex lens. Now he wants to focus a distant lamp on the screen. In which direction should the lens be moved for this purpose with respect to the screen, to get a sharp image on the screen?

Q. A student obtained a sharp image of the grill of a window in the laboratory on a screen, using a convex lens. For getting better results, her teacher suggested focussing of a distant tree instead of the grill. In which direction should the lens be moved for this purpose to get a sharp image on the screen?
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Q. A student performs an experiment on finding the focal length of a convex lens by keeping a lighted candle on one end of laboratory table, a screen on its other end and the lens between them as shown in the figure. The positions of the three are adjusted to get a sharp image of the candle flame on the screen.
If now the candle flame were to be replaced by a distant lamp on a far away electric pole, the student would be able to get a sharp image of this distant lamp on the screen by moving:

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(4) neither the screen nor the lens

Q. In order to determine the focal length of a concave mirror, a student obtained a sharp image of the grill of a window in the laboratory wall on a screen. His teacher suggested that to get better result for focal length, he should focus a distant tree instead of the window grill. In which direction should the mirror be moved for this purpose so as to get a sharp image of the tree on the screen?
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(3) towards the screen
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Q. Sangita performed an experiment to find the focal length of a convex lens. She placed a lighted candle on one end of a laboratory table, a screen on its other end and the lens in between the two as shown in the figure. She adjusted the positions of the three to obtain a sharp image of the candle flame on the screen.
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