A spherical mirror forms an erect image three times the size of the object

PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

A spherical mirror forms an erect image three times the size of the object. If the distance between the object and the image is

80\text{ cm}

, the nature and focal length of the mirror are (1) Concave,

30\text{ cm}

(2) Convex,

30\text{ cm}

(3) Concave,

15\text{ cm}

(4) Convex,

15\text{ cm}