Parallel rays of light that hit a concave mirror will come ...

[DelorasTo]

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

[nital]

Answer to Question 1

A

Answer to Question 2

C

[DelorasTo]

Thanks for the timely response, appreciate it

[phuda]

Wow, this really help