4. We can use a lens as a distance gauge. For example, if I have a lens with a focallength of 50 mm, and I focus an image of an object on a screen which is 51 mm from thelens, how far away is the object?

The expression for the focal length of either the convex or concave lens is,

Answered: 4. We can use a lens as a distance…

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter25: Geometric Optics

Section: Chapter Questions

Problem 45PE: A camera lens used for taking close-up photographs has a focal length of 22.0 mm. The farthest it...

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Similar questions

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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?
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The accommodation limits for a nearsighted persons eyes are 18.0 cm and 80.0 cm. When he wears his glasses, he can see faraway objects clearly. At what minimum distance is he able to see objects clearly?
The near point of an eye is 75.0 cm. (a) What should be the power of a corrective lens prescribed to enable the eye to see an object clearly at 25.0 cm? (b) If, using the corrective lens, the person can see an object clearly at 26 0 cm but not at 25.0 cm, by how many diopters did the lens grinder miss the prescription?
A particular nearsighted patient cant see objects clearly beyond 15.0 cm from their eye. Determine (a) the lens power required to correct the patients vision and (b) the type of lens required (converging or diverging). Neglect the distance between the eye and the corrective lens.
A digital camera equipped with an f = 50.0-mm lens uses a CCD sensor of width 8.70 mm and height 14.0 mm. Find the closest distance from the camera to a 1.80-m-tall person if the persons full image is to 6t on the CCD sensor.
A digital camera equipped with an f = 50.0-mm lens uses a CCD sensor of width 8.70 mm and height 14.0 mm. Find the closest distance from the camera to a 1.80-m-tall person if the persons full image is to 6t on the CCD sensor.
A camera with a 50.0 mm focal length lens is being used to photograph a person standing 3.00 m away. (a) How far from the lens must the film be? (b) If the film is 36.0 mm high, what fraction of a 1.75 m tall person will ?t on it? (c) Discuss how reasonable this seems, based on your experience in taking or posing for photographs.
(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?
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4. We can use a lens as a distance gauge. For example, if I have a lens with a focal length of 50 mm, and I focus an image of an object on a screen which is 51 mm from the lens, how far away is the object?