TG EAMCET 3 May 2025 Shift 1 Paper

Focal length of concave mirror
f=‌

R

2

=‌

−30

2

=−15cm
Object distance from the pole of the mirror
u=−(f+10)=−(−15+10)=5cm
According to question, for real image formed by a concave mirror, the object must be placed beyond the focal point. If the object is 10 cm from the principle focus and the focal length is 15 cm , the object distance from the pole is
u=−(15+10)=−25cm
Using mirror formula,
‌‌

1

f

=‌

1

u

+‌

1

v

⇒‌

1

−15

=‌

1

−25

+‌

1

v

⇒‌

1

v

=‌

1

25

−‌

1

15

=‌

−2

75

∴‌v=−37.5cm
∴‌m=‌

hi

h0

=‌

−v

u

⇒‌

hi

3.6

=‌

−37.5

−25

⇒hi=−5.4cm
The negative sign indicates that the image is real and inverted.