A student focuses the image of a candle flame, placed at about 2 m from a convex lens of focal length 10 cm, on a screen. After that he moves gradually the flame towards the lens and each time focuses its image on the screen.
- In which direction does he move the lens to focus the flame on the screen?
- What happens to the size of the image of the flame formed on the screen?
- What difference is seen in the intensity (brightness) of the image of the flame on the screen?
- What is seen on the screen when the flame is very close (at about 5 cm) to the lens?
CBSE OUTSIDE DELHI - SET 3 2017
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- He moves the lens away from the screen to focus the image.
- Size of the image increases.
- The intensity of image decreases as the flame moves towards the lens.
- Nothing can be seen on the screen as in this case the image formed is virtual which can't be obtained on the screen.
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