Suppose you have focused on a screen the image of candle flame placed at the farthest end of the laboratory table using a convex lens. If your teacher suggests you to focus the parallel rays of the Sun, reaching your laboratory table, on the same screen, what you are expected to do is to move the:; A. lens slightly towards the screen; B. lens slightly away from the screen; C. lens slightly towards the Sun; D. lens and screen both towards the Sun(All India - 2016)
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Answer:
D)lens and screen both towards the sun
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Answer:
A. lens slightly towards the screen
Explanation:
When focusing on a screen where image of candle flame placed at the farthest illuminated distant object, the image distance is increased. Because of this object distance will decrease hence the distance between the lens which is convex and the screen will also be decreased. Therefore we are expected to do is to move the lens slightly towards the screen.
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