Q 63

Expert-verified
Found in: Page 993

### 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 dentist uses a curved mirror to view the back side of teeth in the upper jaw. Suppose she wants an upright image with a magnification of 1.5 when the mirror is 1.2 cm from a tooth. Should she use a convex or a concave mirror? What focal length should it have?

She should use a Concave mirror with focal length = 3.6 cm

See the step by step solution

## Step 1. Given Information is :Image should be uprightRequired magnification of the mirror, m = 1.5Distance between the mirror and tooth, s = 1.2 cm

We need to find out whether the dentist should use convex or concave mirror and calculate the focal length of the mirror.

## Step 2. Using Lateral Magnification relation with s' and s where s' is the image distance and s is the object distance.

Using Mirror Formula,

f is positive which means the mirror is Concave towards the object.