For a curved mirror, the law of reflection holds for
A) the mirror as with a plane mirror.
B) tiny segments that act as plane surfaces.
C) both convex and concave mirrors.
D) only convex mirrors.
Answer: B
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The temperature of an object from which no heat energy can be extracted is
a. 0° F. b. 0° C. c. 0 K. d. 100 K. e. 100° C.
The visual wavelength image shown above is an object that is found in and near star-forming regions
a. True
b. False
Vision Problems: A person's hyperopic (farsighted) eye can focus on objects that are 75 cm away and farther. What power and what focal length contact lenses should be prescribed so this person can see objects 25 cm and farther from the eye?
Fill in the blank(s) with the appropriate word(s).
A light-emitting diode has a power output of 0.3 W. If 590 nm is the average wavelength of the source, about how many photons are emitted per second? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, and 1 nm = 10?9 m)
a. 1021 b. 1025 c. 1018 d. 1029