Page 1 - HA-refraction by spherical lens
P. 1
MCQ (BOARD)
1. A student obtained a sharp image of the grill of a window on a screen using a
convex lens. For getting better result, the teacher suggested focusing of a distant
tree instead of the grill. For this purpose, the lens should be moved
a) behind the screen.
b) away from the screen.
c) very far away from the screen.
d) towards the screen.
2. A sheet of paper catches fire when a lens is held close to it in sunlight. The lens is
a) concave lens of large focal length.
b) concave lens of short focal length.
c) convex lens of large focal length.
d) convex lens of short focal length.
3. While performing an experiment on determination of focal length of a convex lens,
four students obtained the image of the same distant tree on the screen as follows:
Which diagram shows the formation of image correctly?
(a) A
