Problem 24.33 The objective lens of a telescope is a symmetric glass lens with 1

Question

Problem 24.33

The objective lens of a telescope is a symmetric glass lens with 140 cm radii of curvature. The eyepiece lens is also a symmetric glass lens.

Part A

What are the radii of curvature of the eyepiece lens if the telescope's magnification is 20×?

Express your answer to two significant figures and include the appropriate units.

Problem 24.33

The objective lens of a telescope is a symmetric glass lens with 140 cm radii of curvature. The eyepiece lens is also a symmetric glass lens.

Part A

What are the radii of curvature of the eyepiece lens if the telescope's magnification is 20×?

Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

the formula for magnification is given by

m=Fo/Fe=(Ro/2)/(Re/2)=Ro/Re

=>20=140/Re

=>Re=140/20 cm

=>Re=7 cm

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