CBSE Class 10 Science 2017 · Paper 31(B)/C · Question 36
Using a convex lens a student has focused a very small sized image of a candle flame on a screen. If keeping the position of the lens fixed he gradually, in steps, shift the candle towards the lens, then every time
- (i)in which direction he will have to move the screen in order to have distinct image on it ?
- (ii)How would the size of the image change ? Will the intensity of the image increase or decrease ?
Answer
The screen is moved away from the lens; the image gets larger and its intensity decreases.
(i) Away from the lens: each time the candle is brought nearer (while it stays beyond the focus), the image forms farther from the lens, so the screen has to be moved away from the lens.
(ii) The image becomes larger each time (it stays real and inverted). Its intensity decreases: the image grows faster than the light the lens collects, so the light is spread more thinly over it.
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