Question

The focal length of a spherical mirror is -20m.Find nature and radius of curvature of mirror.

Answer 1

Answer:

radius of curvature of spherical mirrors is the distance between pole and centre of curvature. focal length is half the radius of curvature. so here focal length will be 12 cm.

Answer 2

QUESTION:

The focal length of a spherical mirror is -20m.Find nature and radius of curvature of mirror.

ANSWER:

RADIUS OF CURVATURE :

It is the geometric centre of the sphere from which reflecting surface is a part.

FOCAL LENGTH :

DISTANCE from the pole of the mirror to the focus.

we know that;

$radius \: of \: curavature = 2 \times focal \: length$

now;

$radius \: of \: curvature = 2 \times ( - 20m) \\ = - 40m$

FINAL ANSWER :

$\huge\fcolorbox{red}{yellow}{radius of curvature = -40 m}$

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