EBK PHYSICS FOR SCIENTISTS & ENGINEERS
5th Edition
ISBN: 9780134296074
Author: GIANCOLI
Publisher: VST
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Chapter 33, Problem 36P
(II) Suppose that a correct exposure is
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Suppose that a correct exposure is 1/250 at f/ 11. Underthe same conditions, what exposure time would be neededfor a pinhole camera (Problem 64) if the pinhole diameter is1.0 mm and the film is 7.0 cm from the hole?
64. A pinhole camera uses a tiny pinhole instead of alens. Show, using ray diagrams, how reasonably sharpimages can be formed using such a pinhole camera. Inparticular, consider two point objects 2.0 cm apart that are1.0 m from a 1.0-mm-diameter pinhole. Show that on apiece of film 7.0 cm behind the pinhole the two objectsproduce two separate circles that do not overlap.
Two lenses (f1=100 mm, f2=-150 mm) are used to form an image of a candle on an observation screen. The distance between the lenses is kept small and is measured to be 3.5 cm. The distance of the candle from the center of both lenses is measured to be 82 cm. The distance of the image from the center of both lenses is measured to be 22 cm.
(i) What are the experimental focal length of the two combined lenses?
(a) 60 mm (b)1040 mm (c) 576.43 mm (d) 173.47 mm
(ii) What are the theoretical focal lengths of the two combined lenses?
(a) -50 mm (b) 176.47 mm (c) 280.37 mm (d) 52.63 mm
Use conceptual arguments to show that the intensity of light (energy per unit area per unit time) reaching the film in a camera is proportional to the square of the reciprocal of the f - number as (b) The correct exposure time for a camera set to f/1.8 is (1/500) s. Calculate the correct exposure time if the f - number is changed to f/4 under the same lighting conditions. Note: “f/4,” on a camera, means “an f - n umber of 4.”
Chapter 33 Solutions
EBK PHYSICS FOR SCIENTISTS & ENGINEERS
Ch. 33 - Where must the film be placed if a camera lens is...Ch. 33 - A photographer moves closer to his subject and...Ch. 33 - Use ray diagrams to show that a real image formed...Ch. 33 - Light rays are said to be reversible. Is this...Ch. 33 - A cat with its tail in the air stands facing a...Ch. 33 - An underwater lens consists of a carefully shaped...Ch. 33 - (III) A bright object is placed on one side of a...Ch. 33 - (II) A diverging lens with a focal length of 14 cm...Ch. 33 - (II) Suppose that a correct exposure is 1250S at f...Ch. 33 - (I) A human eyeball is about 2.0 cm long and the...
Ch. 33 - (II) Reading glasses of what power are needed for...Ch. 33 - (II) The closely packed cones in the fovea of the...Ch. 33 - (II) Sherlock Holmes is using an...Ch. 33 - (II) A converging lens of focal length = 12 cm is...Ch. 33 - (III) Given two 12-cm-focal-length lenses, you...Ch. 33 - A small object is 25.0 cm from a diverging lens as...Ch. 33 - Two converging lenses are placed 30.0 cm apart....
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