When a simple magnifying glass is used properly, the image will be formed
a. at the focal point of the lens.
b. just inside the focal length of the lens.
c. about 500 millimeters behind the lens.
d. about 250 millimeters in front of the lens.

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.