Question

The radius of curvature for a spherical mirror is – 40cm. What is it’s focal length and the nature of the mirror?​

Answer 1

Answer:

The radius of curvature is double the numerical value of the focal length of a spherical mirror. (The focal length is a point on the principal axis where rays coming parallel to the axis from infinity meet.) Therefore, the answer is option (D); 40 cm.

Answer 2

Answer:

focal length = -20cm

nature of mirror is concave mirror

Step-by-step explanation:

We know that the focal length is half the radius of curvature

so -40/2= -20cm

A concave mirror has the focal length as negative (according to the cartisian plane system)