Question

find focal length of a convex mirror whoes radius of curvature is 20 cm​

Answer 1

Answer:

as we know from

f=2R

• R=f/2
• $20 \div 2$
• = 10cm
• the focal length of a convex mirror is 10cm

Answer 2

Explanation:

1/f=(n-1)(1/R-1/R)

1/f=(n-1)(1/20-1/20)

1/f=(n-1)*0

1/f=(n-1)