Question

. i)You are given a convex lens of focal length 30 cm. At what distance from the lens (range) should you hold the candle flame to observe A real , magnified image A virtual, magnified image A real, inverted, smaller image of the flame.

Answer 1

Answer:

Explanation:

Here, f=30cm.

(a) To obtain, a real and magnified image,object must lie between f and 2f i.e., distance of flame from the lens should lie between 30 and 60cm.

( b) To obtain a virtual image, object must lie between principal focus and optical centre of the lens i.e., distance of flame from the lens should lie between 0 and 30cm.

(c ) To obtain, a real , inverted and smaller image of the flame, object must lie beyond 2f of the lens, i.e., the flame should be held at a distance be held at a more than 60cm from the lens.

Answer 2

Answer:

convex focal length 30 cm smaller image virtual magnified image