A convex lens of focal length forms a sharp image of an object on a screen placed on…

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

Problem

A convex lens of focal length

20\,\text{cm}

forms a sharp image of an object on a screen placed

60\,\text{cm}

on the other side of the lens. How far from the lens is the object? (a)

40\,\text{cm}

in front of the lens (b)

30\,\text{cm}

in front of the lens (c)

15\,\text{cm}

in front of the lens (d)

60\,\text{cm}

in front of the lens