The focal length of a spherical mirror of radius of curvature 30 cm is : (a) 10 cm (b) 15 cm (c) 20 cm (d) 30 cm

Open in App

Solution

Answer : (b) 15 cm

Explanation:
Focal length (f) and radius of curvature (R) are related as R=2f
f = R/2
(R = 30cm)
So, f = 30/2 = 15cm

Suggest Corrections

Similar questions

If the focal length of a spherical mirror is 12.5 cm, its radius of curvature will be : (a) 25 cm (b) 15 cm (c) 20 cm (d) 35 cm

Q. A man holds a spherical shaving mirror of radius of curvature 60 cm, and focal length 30 cm, at a distance of 15 cm, from his nose. Find the position of image, and calculate the magnification.

The focal length of the convex mirror is 20 cm, its radius of curvature will be:

Q. A real image of half the size is obtained in a concave spherical mirror with a radius of curvature of 40 cm. The distance of the object and that of its image from the mirror will be respectively

What is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror or convex mirror) ? Calculate the focal length of a spherical mirror whose radius of curvature is 25 cm.

Join BYJU'S Learning Program

The focal length of a spherical mirror of radius of curvature 30 cm is : (a) 10 cm (b) 15 cm (c) 20 cm (d) 30 cm

Answer : (b) 15 cm Explanation: Focal length (f) and radius of curvature (R) are related as R=2f f = R/2 (R = 30cm) So, f = 30/2 = 15cm

Answer : (b) 15 cm

Explanation:
Focal length (f) and radius of curvature (R) are related as R=2f
f = R/2
(R = 30cm)
So, f = 30/2 = 15cm