Author Question: Parallel rays of light that hit a concave mirror will come together: a. at the focal point. b. at ... (Read 12 times)

DelorasTo · **on:** Jul 28, 2018

Parallel rays of light that hit a concave mirror will come together:
a. at the focal point.
b. at a point half way to the focal point.
c. at infinity.
d. at the center of curvature.

Question 2

What temperature increase is necessary to increase the power radiated from an object by a factor of 16?
a. 8 K
c. 100
b. 2 K
d. about 68