Question

Rays from sun converge at a point 20 cm in front of a concave mirror. Where should an
object be placed that size of its image is equal to the size of the object?
(a) 20 cm in front of the mirror
(b) 40 cm in front of the mirror
(c) Between 20 cm and 40 cm in front of the mirror
(d) More than 40 cm in front of the mirror
renced by 100% (assume that temperature remains
T 1​

Answer 1

Rays from sun converge at a point 20 cm in front of a concave mirror. Where should an
object be placed that size of its image is equal to the size of the object?
(a) 20 cm in front of the mirror
(b) 40 cm in front of the mirror
(c) Between 20 cm and 40 cm in front of the mirror
(d) More than 40 cm in front of the mirror
renced by 100% (assume that temperature remains
T 1
Busy but

Answer 2

Answer:

(b) 40 cm in front of the mirror

Explanation:

the point of convergence of rays is focus of concave mirror. 20 cm is the focal length... double the focal is the centre of curvature i.e. 2×20 = 40 cm.

when object is at C we obtain the same sized image