Convex and concave mirrors have the same radii of curvature R. The distanc between the
mirrors is 2R. At what point on the common optical axis of the mirrors should a point source of
light A be placed for the rays to coverage at the point A after being reflected first on the convex
and then on the concave mirror?

Explanation

for convex mirror
`1/v+1/(-x)=(1)/(+R//2)`
`:. 1/v=2/R+1/x or v=(Rx)/(R+2x)`
Now, applying mirror formula for mirror we have
`(1)/(-(2R-x))+(1)/(-(2R+v))=(1)/(-R//2)`
Solving this equation , we cam find value of x.