A STUDENT OBTAIN A CLEAR IMAGE OF A CANDLE ON A SCREEN WITH THE HELP OF CONVEX LENS HE NOW WANTS TO FOCUS ON A DISTANT TREE AND OBTAIN A CLEAR IMAGE. IN WHICH DIRECTION SHOULD HE MOVE THE LENS IN ORDER TO GET A CLEAR IMAGE?
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Answer:
A student obtains sharp image of candle on screen using convex lens.
To focus distant lamp , where the lens should be placed?
The lens should be moved towards screen so that a clear image and sharp image is obtained.
Explanation:
When we move lens towards screen, then object moves farther away from lens. Hence we can consider object at infinity , light rays from infinity incident on convex lens, after refraction converge at focus and image is formed there.
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