Question

a student has focussed the magnified image of a candle flame on the screen using a convex lens. now he gradually moves the candle flame towards the lens and each time focuses the image on the screen. (a) in which direction - towards or away from the lens, does he move the screen each time to focus the flame ? (b) what happen to the size of image-does it increase or decrease? (c) what will he observe on the screen if he moves the candle flame very close to the lens?

Answer 1

here's the answer , hope it helps . if good tag as brainliest.

a) He will move the screen away from the lens . Because nearer the object comes to the lens the farther the image goes .

b) The size of image increases as more the object near to the lens more the enlarged is image.

c) If he moves the candle very close to the lens as near as the object distance is less than the focal length ,there will be no image on screen because now the image formed is virtual not real (last case of convex lens when object is between o and f )