TG EAMCET 3 May 2025 Shift 2 Paper

Focal length of primary mirror
f1=‌

R1

2

=‌

25

2

=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.