10. I want to build a telescope with lenses of focal lengths 20 cm and 1 cm.a. Which lens is most appropriate as the eyepiece (the one you look into)? Why?b. What should be the spacing between the lenses when I focus at a distant (treat asinfinity) object?c. If I try to look at a closer object (say a bird in a tree), this means d. for the objective(first lens) is smaller, so d, for this same lens must now be longer. This means tofocus on a closer object, I must increase the spacing between the two lenses. I makemy telescope so I can lengthen the distance between the lenses by 2 cm. What is theclosest object can I focus on?

(a)Magnification of a telescope is calculated as follows:

Answered: 10. I want to build a telescope with…

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter25: Optical Instruments

Section: Chapter Questions

Problem 20P: A person sees clearly wearing eyeglasses that have a power of 4.00 diopters when the lenses are 2.00...

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Similar questions

A small telescope has a concave mirror with a 2.00-rn radius of curvature for its objective. Its eyepiece is a 4.00 cm-focal length lens. (a) What is the telescope’s angular magnification? (b) What angle is subtended by a 25,000 km-diameter sunspot? (c) What is the angle of its telescopic image?
Give three advantages that the Fresnel lens design has over that of a conventional lens with the same size and focal length.
(a) What is the maximum angular magnification of an eyeglass lens having a focal length of 18.0 cm when used as a simple magnifier? (b) What is the magnification of this lens when the eye is relaxed?
A small telescope has a concave mirror with a 2.00 m radius of curvature for its objective. Its eyepiece is a 4.00 cm focal length lens. (a) What is the telescope’s angular magnification? (b) What angle is subtended by a 25.000 km diameter sunspot? (c) What is the angle of its telescopic image?
A person sees clearly wearing eyeglasses that have a power of 4.00 diopters when the lenses are 2.00 cm in front of the eyes. (a) What is the focal length of the lens? (b) Is the person nearsighted or farsighted? (c) If the person wants to switch to contact lenses placed directly on the eyes, what lens power should be prescribed?
62. Your task in physics lab is to make a microscope from two lenses. One lens has a focal length of 10 cm, the other a focal length of 3.0 cm. You plan to use the more powerful lens as the objective, and you want its image to be 16 cm from the lens, as in a standard biological microscope. a. How far should the objective lens be from the object to produce a real image 16 cm from the objective? b. What will be the magnification of your microscope?
1. An amateur astronomer has a telescope to examine distant stars and nebulae. The focal length of the main objective lens of the telescope is f= 710 mm. At what distance from the lens will a distant star be imaged using this objective lens? Give your answer in units of metres.
1. You have a thin lens of focal length 50 mm. a. The object is 100 mm to the left of the lens. Where is the image located (that is, what is the image distance q, including sign - express in millimeters)? Is the image real or virtual? What is the magnification? b. The object is 1 meter to the left of the lens. Where is the image located (that is, what is the image distance q, including sign - express in millimeters)? Is the image real or virtual? What is the magnification? c. The object is 20 mm to the left of the lens. Where is the image located (that is, what is the image distance q, including sign - express in millimeters)? Is the image real or virtual? What is the magnification?
A. How far from a 20 cm focal length lens should you place an object to create an image 40 cm from the lens on the opposite side? Is the image real or virtual? Is the image upright or inverted? B. An object is 15 cm from a lens and its image is 30 cm away and on the same side of the lens as the object. Calculate the magnification. If the object is actually 10 cm tall, how tall is the image? C. You are supposed to make a lens that can produce an image at a distance of 50 cm when an object is placed 20 cm from the lens on the opposite side. What is the lens focal length? Will the image be bigger or smaller than the object? Why?
A. A converging lens (n = 1.50) has radii of curvature of 2.50 cm and 5.00 cm; you will need to assign the correct signs. Determine the focal length of lens-1. B. A cup of Darjeeling (10 cm tall) is placed 5.00 cm in front of lens-1. Compute the position and magnification of the image. C. A diverging mirror, of radius 15 cm, is placed 20 cm to the right of the converging lens. Determine the (i) position, (ii) final magnification (and its image characteristics), and (iii) size of the final image.
1. Imagine you were given a converging lens and a meter stick and sent outside on a sunny day. In a paragraph or two, describe a method to measure, as accurately as possible, the focal length of the lens using only the lens, a meter stick, and your outside surroundings. Explain your reasoning.
5. A 2 m tall person is standing 4 meters away from me. I have a camera with a zoom lens (one with an adjustable focal length). I want the person's image on the film to be 2 cm tall. To what focal length should I adjust my lens?

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