Essential University Physics (3rd Edition)
3rd Edition
ISBN: 9780134202709
Author: Richard Wolfson
Publisher: PEARSON
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Textbook Question
Chapter 31, Problem 44P
An object 15 cm from a concave mirror has a virtual image magnified 2.5 times. What’s the mirror’s focal length?
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Chapter 31 Solutions
Essential University Physics (3rd Edition)
Ch. 31.1 - You stand in front of a plane mirror whose top is...Ch. 31.1 - Where would you place an object so that its real...Ch. 31.2 - Prob. 31.3GICh. 31.3 - A thin lens has focal length +50 cm. Which of the...Ch. 31.4 - If you look backward through a refracting...Ch. 31 - How can you see a virtual image, when its not...Ch. 31 - Under what circumstances will the image in a...Ch. 31 - If you're handed a converging lens, what can you...Ch. 31 - A diverging lens always makes a reduced image....Ch. 31 - Is there any limit to the temperature you can...
Ch. 31 - Can a concave mirror make a reduced real image? A...Ch. 31 - If you placed a screen at the location of a...Ch. 31 - If you look into the bowl of a metal spoon, you...Ch. 31 - Is the image on a movie screen real or virtual?...Ch. 31 - Does a fish in a spherical bowl appear larger or...Ch. 31 - A block of ice contains a hollow, air-filled space...Ch. 31 - The refractive index of the human cornea is about...Ch. 31 - Do you want a long or short focal length for a...Ch. 31 - Prob. 14FTDCh. 31 - A shoe store uses small floor-level mirrors to let...Ch. 31 - A candle is on the axis of a 15-cm-focal-length...Ch. 31 - Prob. 17ECh. 31 - A virtual image is located 40cm behind a concave...Ch. 31 - (a) Where on the axis of a concave mirror would...Ch. 31 - A lightbulb is 56 cm from a convex lens. Its image...Ch. 31 - By what factor is the image magnified for an...Ch. 31 - A lens with 50-cm focal length produces a real...Ch. 31 - By holding a magnifying glass 25 cm from your desk...Ch. 31 - A real image is four times as far from a lens as...Ch. 31 - Prob. 25ECh. 31 - Youre writing specifications for a new line of...Ch. 31 - Prob. 27ECh. 31 - The bottom of a swimming pool looks to be 1.5 m...Ch. 31 - Prob. 29ECh. 31 - Youre underwater, looking through a spherical air...Ch. 31 - You have to hold a book 55 cm from your eyes for...Ch. 31 - What focal length should you specify if you want a...Ch. 31 - Youre an optometrist helping a nearsighted patient...Ch. 31 - A particular eye has a focal length of 2.0 cm...Ch. 31 - A compound microscope has objective and eyepiece...Ch. 31 - (a) Find the focal length of a concave mirror if...Ch. 31 - A 12-mm-high object is 10cm from a concave mirror...Ch. 31 - Repeat Problem 37 for a convex mirror, assuming...Ch. 31 - An objects image in a 27-cm-focal-length concave...Ch. 31 - Youre asked to design a concave mirror that will...Ch. 31 - Viewed from Earth, the Moon subtends an angle of...Ch. 31 - Prob. 42PCh. 31 - LCD projectors commonly used for computer and...Ch. 31 - An object 15 cm from a concave mirror has a...Ch. 31 - How far from a page should you hold a lens with...Ch. 31 - A converging lens has focal length 4.0 cm. A...Ch. 31 - A lens has focal length f = 35 cm. Find the type...Ch. 31 - How far apart are the object and image produced by...Ch. 31 - A candle and a screen are 70cm apart. Find two...Ch. 31 - Prob. 50PCh. 31 - How far from a 25-cm-focal-length lens should you...Ch. 31 - An object and its lens-produced real image are 2.4...Ch. 31 - An object is 68 cm from a plano-convex lens whose...Ch. 31 - Prob. 54PCh. 31 - Rework Example 31.4 for a fish 15.0 cm from the...Ch. 31 - Prob. 56PCh. 31 - Prob. 57PCh. 31 - A contact lens is in the shape of a convex...Ch. 31 - For what refractive index would the focal length...Ch. 31 - An object is 28 cm from a double-convex lens with...Ch. 31 - Youre an optician whos been asked to design a new...Ch. 31 - A double-convex lens with equal 28.5-cm curvature...Ch. 31 - An object placed 17.5 cm from a convex lens of...Ch. 31 - Youre taking a photography class, working with a...Ch. 31 - A camera can normally focus as close as 60cm, but...Ch. 31 - A 300-power compound microscope has a...Ch. 31 - To the unaided eye, Jupiter has an angular...Ch. 31 - A Cassegrain telescope like that shown in Fig....Ch. 31 - You stand with your nose 6.0 cm from the surface...Ch. 31 - A contact lens prescription calls for...Ch. 31 - Show that placing a 1-diopter lens in front of a...Ch. 31 - Derive an expression for the thickness t of a...Ch. 31 - Show that identical objects placed equal distances...Ch. 31 - Generalize the derivation of the lensmakers...Ch. 31 - Draw a diagram like Fig. 31.10, but showing a ray...Ch. 31 - Prob. 76PCh. 31 - The maximum magnification of a simple magnifier...Ch. 31 - Chromatic aberration results from variation of the...Ch. 31 - For visible wavelengths, the refractive index of...Ch. 31 - The table below shows measurements of...Ch. 31 - Zooming your camera's lens for telephoto shots...Ch. 31 - Increasing the f-ratio from 2.8 to 5.6 a....Ch. 31 - Youre given two lenses with different diameters....Ch. 31 - If a lens suffers from spherical aberration,...
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