Check out this optics problem:
A small convex mirror is placed 60cm from the pole and on the axis of a large concave mirror of R=200cm. The position of the convex mirror is such that the image of a distant object is formed in the plane of the hole cut at the Centre of the concave mirror.
Find height of the final image of the distant object if it subtends an angle of (½)° at the pole of the concave mirror.