Question

19.
An object placed 5cm from the pole of a concave mirror produces a real image
magnified four times. Then find the radius of curvature of the mirror ?​

Answer 1

Answer:

radius of the curvature of the mirror is -8cm

Explanation:

u(object distance)= -5cm  {object distance is always negative}

m=-4 (magnification given in question)

m= $\frac{f}{f-u}$

-4 = $\frac{f}{f-(-5)}$

-4 = $\frac{f}{f+5}$

-4f-20=f

-5f=20

f=-4

R=2f

R=-8cm