When describing image formation in mirrors what is the angle of the reflection? A. The angle the light ray makes in the medium with a higher index of refraction.
B. The angle the light ray makes as it leaves the surface.
C. The angle the light ray makes in the medium with a lower index of refraction.
D. The angle the light ray makes as it strikes the surface.

Two large, flat, horizontally oriented plates are parallel to each other, a distance d apart. half way betwween the two plates the electric field has magnitude e. if the separation of the plates is reduced to d/2 what is the magnitude of the electric field half way between the plates?

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?