When light passes through a prism of glass, 1. refraction changes the directions of different colors or wavelengths of light. 2. the prism absorbs colors from different parts of the broad beam coming out of the prism, leaving the complementary colors that we see. 3. different colors are caused by multiple reflections within the prism and the resulting interference between the beams. 4. the prism adds colors to different parts of the outgoing and broadly scattered beam?

Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.

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Would it be correct to say the doppler effect is the apparent change in the speed of a wave due to the motion of the source? be sure to fully explain your position using at least 3 complete content related sentences.