A convex lens forms a virtual

PHYSICS · Subjective · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

A convex lens forms a virtual, erect image of an object placed

15\,\text{cm}

in front of it. The focal length of the lens is

20\,\text{cm}

. State the algebraic sign (

+

−

) of each of the following quantities according to the Cartesian sign convention: (i) object distance

u

(ii) image distance

v

(iii) focal length

f

(iv) magnification

m