=12.5cm Since, object is at infinity, so the image formed by the primary mirror will be at its focus. ∴‌‌v1=f1=12.5cm Focal length of secondary mirror, ‌f2=−‌
R2
2
=‌
−16
2
=−8cm ∴‌‌u=12.5−2.5=10cm Using mirror formula, ‌
1
f
‌=‌
1
v
+‌
1
u
‌
1
−8
‌=‌
1
v
+‌
1
−10
⇒‌
1
v
=‌
1
10
−‌
1
8
=−‌
1
40
⇒v‌=−40cm Thus, the final image is formed at a distance of 40 cm from the convex mirror.
