A student obtains a clear image of a candle on a screen with the help of a 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?
1) Behind the screen
2) Away from the screen
3) Towards the screen
4) At a very long distance from the screen
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The lens is moved towards the focus.
Explanation:
- When the lens is ‘moved towards the screen’ the distant between the tree and the lens increases further. Hence now we can consider the rays of the light to come from infinity.
- Also the ‘rays of light’ from infinity when comes in contact with a lens are converged on the surface of the screen which is the focus of the lens.
- The ‘focal point’ of the lens is a place where the rays of light from infinity falls. Hence a clearer image of the object is formed.
Learn more about convex lens
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