A lens forms a sharp real image of an object on a screen away when the object is…

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Geometric Optics · Geometric Optics

Problem

A lens forms a sharp real image of an object on a screen

60\,\text{cm}

away when the object is placed

30\,\text{cm}

from the lens on the opposite side. Which choice correctly identifies the lens type and its focal length? (a) Convex lens,

15\,\text{cm}

(b) Convex lens,

20\,\text{cm}

-60\,\text{cm}

(d) Convex lens,

60\,\text{cm}