Question

(a)
List four characteristics of the image formed by a concave lens of
focal length 20 cm when the object is placed at a distance of 40 em
from its optical centre.
The size of image of an object by a convex lens of focal length 20 cm
is observed to be reduced to - rd of its size. Find the distance of the
(b)
object from the optical centre of the lens.
1/3/3]​

Answer 1

Explanation:

When the object is kept at a distance of 10 cm from the lens, the distance is greater than the focal length. Hence, the image would be real and inverted and would be formed on the . other side of the lens. The distance of the image can be calculated from the lens formula 1v−1u=1f.