Physics

Problem

A photographer records an inverted image that is

1.8

times larger than the object using a single thin lens. When the object is moved

5\,\text{cm}

closer to the lens, the image remains inverted and becomes

2.4

times larger than the object. What is the focal length of the lens? a)

25\,\text{cm}

36\,\text{cm}

30\,\text{cm}

45\,\text{cm}