The name and radius of curvature of a spherical mirror whose focal length is -2 cm isA- -4 cm- ConvexB- -4 cm - ConcaveC- -4 cm- convexD- -4 cm- concave

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Standard X

Physics

Relationship between Focus and Radius of Curvature

The name and ...

Question

The name and radius of curvature of a spherical mirror whose focal length is +2 cm is

+4 cm; concave

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+4 cm; Convex

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-4 cm ; Concave

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-4 cm; convex

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Solution

The correct option is B
+4 cm; Convex

Radius of curvature (R) = 2 x Focal length (f)

Since, f = + 2 cm; therefore, R = 2 x (+ 2) = + 4 cm

It is a convex mirror, since its focal length is positive.

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The name and radius of curvature of a spherical mirror whose focal length is +2 cm is

The correct option is B +4 cm; Convex Radius of curvature (R) = 2 x Focal length (f) Since, f = + 2 cm; therefore, R = 2 x (+ 2) = + 4 cm It is a convex mirror, since its focal length is positive.

The correct option is B
+4 cm; Convex

Radius of curvature (R) = 2 x Focal length (f)

Since, f = + 2 cm; therefore, R = 2 x (+ 2) = + 4 cm

It is a convex mirror, since its focal length is positive.