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Problem Faced by Surface Based Telescope and Telescopes in Space

an electric l...

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an electric lamp and screen are placed on the table in a line at a distant of separation D to get the image of the lamp SRP required convex lens with focal length

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Q. The distance between an electric lamp and a screen is

d = 1 m

. A convergent lens of focal length

f = 21 c m

is placed between the lamp and the lens such that a sharp image of the lamp filaments is formed on the screen.

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.
Shoe now removes the candle flame and obtains the image of a distant lamp on an electric pole. She would be able to get a sharp image of the lamp on the screen by moving

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:

(1) The screen in the direction of the lens or the lens in the direction of the screen
(2) the screen in the direction of the lens or the lens away from the screen
(3) the screen away from the lens or the lens in the direction of the screen
(4) neither the screen nor the lens

Q. 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.

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?

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Problem Faced by Surface Based Telescope and Telescopes in Space

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