Q.
A concave mirror of focal length $20cm$ and a convex lens of focal length $10cm$ are kept with their optic axes parallel but separated by $0.5cm$ as shown in the figure. The distance between the lens and mirror is $10cm$ . An object of height $3mm$ is placed on the optic axis of lens at a distance $15cm$ from the lens. Find the length of the image formed by the mirror in $mm$ .

NTA AbhyasNTA Abhyas 2022
Solution: