A beam of light that is parallel to the principal axis strikes a concave mirror. What happens to the reflected beam of light?
A) It also is parallel to the principal axis.
B) It is perpendicular to the principal axis.
C) It passes through the center of curvature of the mirror.
D) It passes through the focal point of the mirror.
E) It passes between the focal point and the center of curvature of the mirror.
D
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The density of a solid object is defined as the ratio of the mass of the object to its volume. The dimension of density is
A) [M]/[L]. B) [L]3/[M]. C) [M] [L]-3. D) [M][L][T]. E) [M][L].
If a Burger’s circuit is performed around a dislocation, the Burger’s _____________closes the circuit.
Fill in the blank(s) with the appropriate word(s).
If I want to make a red shirt, I would want the pigment called ________________ to be in the shirt.
a. Cyan b. Red c. Blue d. Yellow
Why is dark matter called "dark matter"?
A) It does not interact strongly with light, but it does have gravity like other matter. B) It is made from black holes. C) It absorbs all light and exerts gravity. D) The name is misleading because it is pure energy rather than matter.