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Chapter 35: Q.48 (page 1019)

Your task in physics laboratory is to make a microscope from two lenses. one lens has a focal length of 2.0cm,the other objective, and you want the eyepiece to be 16cmfrom the objective.

(a). For viewing with a relaxed eye, how far should the sample be from the objective lens?

(b). What is the magnification of your microscope?

Short Answer

Expert verified

(a). The sample should be 1.066cmapart from the objective lens.

(b). The magnification of your microscope M≈200.

Step by step solution

01

Part(a) Step 1: Given information

We have given that:

The focal length of eye isfe=2.0cm

the focal length of object isfo=1.0cm

and the distance between eyepiece and object is 16cm.

We need to find what is the magnification of your microscope.

02

Part (a) Step 2: Simplification

We use the formula,

1fo=1S+1d

11-116=1S

1516=1S

S=1.066cm.

Here Sis distance of sample from objective lens, f0is the focal length of the object and dis the distance between lens and object.

03

part (b) step 1: Given Information

We need to find the magnification.

04

part (b) step 2: Calculation

For Magnification we can use:

M=dS1+Dfe

M=161.0661+252

M≈200.

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Most popular questions from this chapter

You’ve 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?

What is thef-numberof a lens with a 35mmfocal length and a7.0mmdiameter aperture?

A friend lends you the eyepiece of his microscope to use on your own microscope. He claims the spatial resolution of your microscope will be halved, since his eyepiece has the same diameter as yours but twice the magnification. Is his claim valid? Explain.

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