Question

Define the focus of a concave mirror. If the radius of curvature of a convex mirror is 60 cm, what would be

its focal length​

Answer 1

Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror. This point is known as the focus of the concave mirror.

f=R/2

f=60/2

f=30cm

Answer 2

The focal length of the concave mirror is +30 cm.

Explanation:

The focus of a concave mirror is defined as number of rays parallel to principal axis when reflected appear to meet at a point on principal axis.

The radius of curvature of a convex mirror is 60 cm. We need to find its focal length. We know that the relation between the radius of curvature and the focal length is given by :

R = 2f

f = +30 cm

So, the focal length of the concave mirror is +30 cm. Hence, this is the required solution.

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