Radius of curvature of convex mirror is 50cm then its focal length is equal to

+25cm

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-25cm

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+0.02cm

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-12.5cm

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Solution

The correct option is A +25cm
Given, radius of curvature of a convex mirror is $R = 50 c m$ .
$∴$ focal length of the mirror is $f = \frac{R}{2} = \frac{50}{2} c m = 25 c m$
Using sign convention, we know, focal length of a convex mirror is always positive.
So, here, $f = + 25 c m$
Thus, the correct option is (A).

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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

If the focal length of a convex mirror is 25 cm, what is its radius of curvature ?

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.

1.7

, as shown in figure. The focal length of plano-convex lens is

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Radius of curvature of convex mirror is 50cm then its focal length is equal to

The correct option is A +25cmGiven, radius of curvature of a convex mirror is R=50cm.∴ focal length of the mirror is f=R2=502cm=25cmUsing sign convention, we know, focal length of a convex mirror is always positive. So, here, f=+25cmThus, the correct option is (A).