Chapter 25, Problem 54PE

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

Chapter
Section

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

# Some telephoto cameras use a mirror rather than a lens. What radius of curvature mirror is needed to replace a 800 mm focal length telephoto lens?

To determine

The required radius of curvature for a mirror to replace a 800mm focal length telephoto lens.

Explanation

Given info:

Focal length of telephoto lens is 800â€„mm.

Formula used:

Relation between focal length and radius of curvature is,

â€ƒâ€ƒf=R2

Here,

• f is the focal length of the telephoto lens.
• R is the radius of curvature of the mirror.

Calculation:

Rearrange the above expression.

â€ƒâ€ƒR=2f

Substitute 800â€„mm for f in above expression

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