Two mirrors are at right angles to one another. A light ray is incident on the first at an angle of 30° with respect to the normal to the surface. What is the angle of reflection from the second surface?
a. 30°
b. 60°
c. 45°
d. 53°
e. 75°
b
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One of the main causes of slow surface evolution is the:
A) depletion of ozone layer. B) erosion due to moving air and water. C) heat released from infalling matter. D) heavy bombardment in the early Solar System.
The critical density of the universe is the
A) total density of matter and energy needed to give the universe a "flat" geometry (in spacetime). B) measured average density of matter in the universe. C) density of matter necessary for stars and galaxies to form. D) density value at which the total density of matter precisely equals the total density of antimatter.
Seasonal changes in the darker surface features of Mars are due to ________
Fill in the blank(s) with correct word
Eddy-current NDT is well suited for detecting cracks in conducting materials that are _________.
Fill in the blank(s) with the appropriate word(s).