The size of the image formed by a convex mirror of focal length 30 cm is a quarter of the size of the real object. Then the distance of the object from the mirror is a) 30cm b) 90cm c) 120cm d) 60cm plz justify the answer !
The distance between the object and the mirror (u) = ?
The distance between the image and the mirror (v) = ?
Let the size of the object be equal to 1.
Given size of the image = 1/4 size of the object.
ho = 1
But we know that
u = -90 cm
The distance of the object from the mirror = 90 cm