Problems based on Radius of curvature of spherical mirrors
Problem-1: The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
Given:
R = 20 cm
To find out:
f = ?
Formula:
R = 2f
Solution:
f = R/2
f = 20/2 = 10 cm
Answer:
Focal length of the spherical mirror, f = 10 cm
Problem-2 – Find the focal length of a convex mirror whose radius of curvature is 32 CM.
Given:
R = 20 cm
To find out:
f = ?
Formula:
R = 2f
Solution:
f = R/2
f = 20/2 = 10 cm
Problems based on magnification
Problem-1: What is the nature of the image formed by a concave mirror if the magnification produced by the mirror is + 4?
Given:
Concave mirror.
m = +4
Concept:
When m > 1, the image is enlarged.
Positive height – Erect
Concave mirror image: Virtual and Erect.
Nature of image: Virtual, erect, enlarged.