1. In which direction does he move the lens to focus the flame on the screen?

CBSE Class 10 CBSE Class 10 Science
1

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.

  1. In which direction does he move the lens to focus the flame on the screen?
  2. What happens to the size of the image of the flame formed on the screen?
  3. What difference is seen in the intensity (brightness) of the image of the flame on the screen?
  4. What is seen on the screen when the flame is very close (at about 5 cm) to the lens?
2
  1. He moves the lens away from the screen to focus the flame on the screen.
  2. The size of the image of the flame formed on the screen increases gradually.
  3. The intensity of the image of the flame on the screen decreases gradually.
  4. When the flame is very7 close (at about 5 cm) to the lens, no image is seen on the’ screen.