/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Q. 18 A 20x聽telescope has a 12cmdiame... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 35: Q. 18 (page 1017)

A 20xtelescope has a 12cmdiameter objective lens. What minimum diameter must the eyepiece lens have to collect all the light rays from an on-axis distant source?

Short Answer

Expert verified

The minimum diameter is6mm.

Step by step solution

01

Given Information.

We have given that:

Magnification isM=20,

Objective lens = 12cmdiameter.

We need to find what minimum diameter must the eyepiece lens have to collect all the light rays from an on-axis distant source.

02

Simplification.

Firstly, we need to find the focal length of eyepiece feye

As we know

M=20

localid="1648754018228" fobj=12cm2=6cm.

Since,

M=fobjfeye

feye=fobjM

feye=6cm20

feye=0.3cm

Therefore the diameter D of the eyepiece:

D=2脳0.3cm

localid="1648632623279" =0.6cm鈫�6mm

Here Dis the diameter, feyeis the focal length of i, fobjis the focal length of the object,Mis a magnification.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

A microscope has a 20cmtube length. What focal-length objective will give total magnification localid="1649845070556" 500脳when used with an eyepiece having a focal length 5.0cm?

Suppose a camera鈥檚 exposure is correct when the lens has a focal length of 8.0 mm. Will the picture be overexposed, underexposed, or still correct if the focal length is 鈥渮oomed鈥� to 16.0 mm without changing the diameter of the lens aperture? Explain

A hydrogen discharge lamp emits light with two prominent wavelengths: 656nm(red) and 486nm(blue). The light enters

a flint-glass prism perpendicular to one face and then refracts

through the hypotenuse back into the air. The angle between

these two faces is 35掳.

a. Use Figure 35.18to estimate to 卤0.002the index of refraction

of flint glass at these two wavelengths.

b. What is the angle (in degrees) between the red and blue light

as it leaves the prism?

Marooned on a desert island and with a lot of time on your hands, you decide to disassemble your glasses to make a crude telescope with which you can scan the horizon for rescuers. Luckily you鈥檙e farsighted, and, like most people, your two eyes have different lens prescriptions. Your left eye uses a lens of power +4.5Dand your right eye鈥檚 lens is +3.0D. a. Which lens should you use for the objective and which for the eyepiece? Explain.

b. What will be the magnification of your telescope?

c. How far apart should the two lenses be when you focus on distant objects?

What is the f-number of a relaxed eye with the pupil fully dilated to 8.0mm? model the eye as a single lens 2.4 cm in front of the retina
See all solutions

Recommended explanations on Physics Textbooks

Nuclear Physics

Read Explanation

Electrostatics

Read Explanation

Electric Charge Field and Potential

Read Explanation

Energy Physics

Read Explanation

Fundamentals of Physics

Read Explanation

Dynamics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.