Chapter 25: Q37PE (page 931)
Your camera’s zoom lens has an adjustable focal length ranging from to mm. What is its range of powers?
Short Answer
The camera lens has an adjustable focal length with range has a range of power .
Chapter 25: Q37PE (page 931)
Your camera’s zoom lens has an adjustable focal length ranging from to mm. What is its range of powers?
The camera lens has an adjustable focal length with range has a range of power .
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Get started for free(a) What is the focal length of a magnifying glass that produces a magnification of \(3.00\) when held \(5.00{\rm{ }}cm\) from an object, such as a rare coin? (b) Calculate the power of the magnifier in diopters. (c) Discuss how this power compares to those for store-bought reading glasses (typically \(1.0\) to \(4.0\)). Is the magnifier’s power greater, and should it be?
Figure 25.49shows a light bulb between two mirrors. One mirror produces a beam of light with parallel rays; the other keeps light from escaping without being put into the beam. Where is the filament of the light in relation to the focal point or radius of curvature of each mirror?
A camera with a 50.0 mm focal length lens is being used to photograph a person standing 3.0 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 17.5 m tall person will fit on it?
(c) Discuss how reasonable this seems, based on your experience in taking or posing for photographs.
What is meant by a negative magnification? What is meant by a magnification that is less than 1in magnitude?
Referring to the electric room heater considered in the first example in this section, calculate the intensity of IR radiation in \({\bf{W}}/{{\bf{m}}^{\bf{2}}}\) projected by the concave mirror on a person \({\bf{3}}.{\bf{00}}{\rm{ }}{\bf{m}}\) away. Assume that the heating element radiates \({\bf{1500}}{\rm{ }}{\bf{W}}\) and has an area of \({\bf{100}}{\rm{ }}{\bf{c}}{{\bf{m}}^{\bf{2}}}\), and that half of the radiated power is reflected and focused by the mirror.
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