Author Question: If a virtual image is formed 8.00 cm along the principal axis from a convex mirror of focal length ... (Read 86 times)

ereecah · **on:** Jul 28, 2018

If a virtual image is formed 8.00 cm along the principal axis from a convex mirror of focal length 15.0 cm, how far is the object from the mirror?
a. 30.0 cm
c. 3.00 cm
b. 6.00 cm
d. 17.1 cm

Question 2

Two stars, A and B, have the same emissivity, but the radii and surface temperatures are different with RA = 2 RB, and TA = 0.5 TB. Assuming the temperature of space to be negligible, which star radiates the most energy per unit time?
a. Star A
b. Star B
c. Both radiate the same amount of energy per unit time.
d. More information is needed in order to make a determination.