A concave mirror has a focal length of

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

Problem

15\,\text{cm}

. According to the Cartesian sign convention, which of the following is the correct value of

f

to be used in numerical calculations? (a)

+15\,\text{cm}

(b)

-15\,\text{cm}

(c)

+7.5\,\text{cm}

(d)

-7.5\,\text{cm}