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Chapter 25: Q54PE (page 931)

Some telephoto cameras use a mirror rather than a lens. What radius of curvature mirror is needed to replace a800mmfocal length telephoto lens?

Short Answer

Expert verified

The radius of curvature of the mirror is1.6m

Step by step solution

01

Definition of the radius of curvature

The radius of the curvature lens is double the focal length of the lens.

02

Calculating radius of curvature

Given values:

f=800mm

First, we have to convert the unit into an SI unit:

f=800.(1mm脳1脳10鈥�3m1mm)=800脳10鈥�3m

The radius of curvature of the mirror can be written as:

R=2f

Substituting the value of focal length in the above equation, we get,

role="math" localid="1654076860828" R=2脳800脳10鈥�3m=1600脳10鈥�3m=1.6m

Hence, the radius of curvature of the mirror is 1.6m

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