College Physics: A Strategic Approach (3rd Edition)
3rd Edition
ISBN: 9780321879721
Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher: PEARSON
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Chapter P.5, Problem 17P
To determine
The height of the image and the intensity.
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A magnifying glass can focus sunlight enough to heat up paper or dry grass and start a fire. A magnifying glass with a diameter of 4.30 cm has a focal length of 6.70 cm. The mean distance of the Sun from Earth is 1.50 × 1011 m. The mean radius of the Sun is 6.957 × 108 m.
If the intensity of the Sun falling on the magnifying glass is 0.850 kW/m2, what is the intensity of the image of the Sun?
__kW/m2
A light wave has a 604 nm wavelength in the air. Its wavelength in a transparent solid is 416 nm. What is the speed of light (in m/s) in this solid?
Often in optics scientists take advantage of effects that require very high intensity light. To get the desired effect a scientist uses a laser with power P = 0.0015 W to reach an intensity of I = 350 W/cm2 by focusing it through a lens of focal length f = 0.15 m. The beam has a radius of r = 0.0011 m when it enters the lens.Randomized VariablesP = 0.0015 WI = 350 W/cm2f = 0.15 mr = 0.0011 m
Part (a) Express the radius of the beam, rp, at the point where it reaches the desired intensity in terms of the given quantities. (In other words, what radius does the beam have to have after passing through the lens in order to have the desired intensity?)
Part (b) Give an expression for the tangent of the angle that the edge of the beam exits the lens with with respect to the normal to the lens surface, in terms of r and f? Part (c) Express the distance, D, between the lens's focal point and the illuminated object using tan(α) and rp. Part (d) Find the distance, D, in centimeters.
Chapter P Solutions
College Physics: A Strategic Approach (3rd Edition)
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