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Chapter 25: Q5PE (page 929)
What is the speed of light in water? In glycerin?
The speed of light in the water is:.
The speed of light in the glycerin is: .
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What is the focal length of a makeup mirror that has a power of
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.
An object \(1.50{\rm{ }}cm\)high is held \(3.00{\rm{ }}cm\)from a person鈥檚 cornea, and its reflected image is measured to be \(0.167{\rm{ }}cm\)high.
(a) What is the magnification?
(b) Where is the image?
(c) Find the radius of curvature of the convex mirror formed by the cornea. (Note that this technique is used by optometrists to measure the curvature of the cornea for contact lens fitting. The instrument used is called a keratometer, or curve measurer.)
A beam of white light goes from air into water at an incident angle of\({75.0^ \circ }\). At what angles are the red (\(660{\rm{ }}nm\)) and violet (\(410{\rm{ }}nm\)) parts of the light refracted?
At what minimum angle will you get total internal reflection of light traveling in water and reflected from ice?
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