The side mirror on a car is convex and has a radius of curvature of 25 cm. Another car is following, 20 m behind the mirror. If the height of the car is 1.6 m, how tall is the image?
A)
5 cm
B)
2 cm
C)
4 cm
D)
3 cm
E)
1 cm
E
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Lens-Maker Formula: A certain camera uses a double-convex lens made of glass with an index of refraction of 1.60. This lens has a radius of curvature of magnitude 12 cm for the first surface and one of magnitude 24 cm for the second surface. What is the focal length of this lens?
Fill in the blank(s) with the appropriate word(s).
The Doppler method seeks to detect planets by
A) precisely measuring distances to stars. B) directly detecting the light of planets orbiting stars. C) measuring small changes in the positions of stars on the sky. D) precisely measuring the velocities of stars moving toward and away from us. E) measuring small changes in the apparent brightness of stars.
Which of the following radiations has the smallest wavelength?
a. Infrared b. Visible c. Ultraviolet d. X-rays
If the polarizing angle (the angle at which reflected light is completely plane polarized) of a flat piece of sapphire is 60.5°, what is its index of refraction?
a. 1.97 b. 1.77 c. 1.59 d. 2.36 e. 1.82