Question

An optical arrangement consists of two concave mirrors M₁ and M₂, and a convex lens L with a common principal axis, as shown in the figure. The focal length of L is 10 cm. The radii of curvature of M₁ and M₂ are 20 cm and 24 cm, respectively. The distance between L and M₂ is 20 cm. A point object S is placed at the mid-point between L and M₂ on the axis. When the distance between L and M₁ is cm n/7, one of the images coincides with S. The value of n is ______.

Answer 1

This image should be at focus of M₁

And further if I₂ is formed at centre of curvature of M₁ then