Which one of the following properties of the beam of light applies to a laser beam?
A) It is coherent.
B) It is incoherent.
C) It is diverging.
D) It is converging.
E) None of the other answers given is correct.
A
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When a force acts in a direction opposite to the motion, ________ work is said to be done on the object.
Fill in the blank(s) with the appropriate word(s).
Magnetic Field of a Current Loop: A current-carrying loop of wire lies flat on a horizontal tabletop. When viewed from above, the current moves around the loop in a counterclockwise sense. For points on the tabletop inside the loop, the magnetic field lines caused by this current
A. circle the loop in a clockwise direction. B. circle the loop in a counterclockwise direction. C. point straight up. D. point straight down.
Snell's Law: A flashlight beam makes an angle of 60° with the plane of the surface of a calm lake before it enters the water. In the water what angle does the beam make with the plane of the surface? The index of refraction of water is 1.33.
A. 0° B. 30° C. 60° D. 22° E. 68°
A beam of light in air is incident on a glass slab at an angle of incidence < 90°. After entering the glass slab, the beam of light
A) does not change its path. B) follows the normal to the glass slab. C) bends away from the normal drawn at the point of contact. D) bends closer to the normal drawn at the point of contact.