Q. 8

Expert-verified
Found in: Page 989

### Physics for Scientists and Engineers: A Strategic Approach with Modern Physics

Book edition 4th
Author(s) Randall D. Knight
Pages 1240 pages
ISBN 9780133942651

# A converging lens creates the image shown in FIGURE Q34.8. Is the object distance less than the focal length f, between f and 2 f, or greater than 2 f? Explain

The object is between f and 2f away.

See the step by step solution

## Step1: Find f:

When we have a converging lens and the image is inverted, real, and magnified (as shown in figure Q34.8), the object is backslash boxed backslash backslash text between f and 2 f away from the lens. Remember the thin lens equation?

we get

## Step2: Find 2f or greater thean 2f

Since then i.e. we see that is positive meaning the image is real and on the other side of the lens (as is the case in this problem). Also, means that i.e. . Therefore

yielding

So we got that only when f<s<2 f then i.e. and the image is also magnified magnified.