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Chapter 35: Q. 37 (page 1018)

You鈥檝e been asked to build a telescope from a 2.0xmagnifying lens and a 5.0xmagnifying lens.

a. What is the maximum magnification you can achieve?

b. Which lens should be used as the objective? Explain.

c. What will be the length of your telescope?

Short Answer

Expert verified

a. The maximum magnification isMmax=2.5.

b. The lens should be used as the objective isL鈮�fR=fL.

c. The length of the telescope isL=7.

Step by step solution

01

Part (a) Step 1: Given Information.

We need to find out the maximum magnification to achieve.

02

Part(a) Step 2 : Simplify

Maximum magnification:

Mmax=fobjfobjMmax=52Mmax=2.5.

03

Part (b) Step 1 : Given Information.

We need to find which lens should be used as the objective.

04

Part (b) Step 2: Explanation.

As we know that the distance between eyepiece and objective lenses are lightly less than to their focal length.

L鈮�fR+fL.

05

Part (c) Step 1 : Given Information.

We need to find the length of the telescope.

06

Part (c) Step 2: Calculation.

Length of telescope is:

L=fR+fLL=5+2L=7.

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