Author Question: A coin is 12 cm in front of a convex lens with focal length of magnitude 4.0 cm. Where is the image? ... (Read 98 times)

Awilson837 · **on:** Jul 29, 2018

A coin is 12 cm in front of a convex lens with focal length of magnitude 4.0 cm. Where is the image?

A) 8.0 cm behind the lens
B) 6.0 cm in front of the lens
C) 6.0 cm behind the lens
D) 4.0 cm in front of the lens

Question 2

A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW.

If the wavelength of the laser light is 642 nm, how many photons does it emit per second? (c = 3.0 108 m/s, h = 6.626 10-34 J s)