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ch.29 15 questions.
mrs. kohl homework 2/10/10
Question | Answer |
---|---|
Why doesn't light travel threw a mirror? | Light doesn't travel threw a mirror, but is returned by its surface. |
A light wave that strikes a boundary is called a_________________ | incident wave. |
A light wave that bounces off a boundary is called a __________ | reflected wave. |
A line drawn perpendicular to the point where the incident ray strikes the barrier is called a _______________ | normal |
What is a flat mirror called? | a plane mirror |
What type of mirror curves outward? | convex mirror |
What type of mirror curves inward? | concave mirror |
What happens when light is incident on a rough surface? | It is reflected in many directions. |
Sound energy is not reflected, but is________ or________ | absorbed or transmitted |
What is an echo? | a reflected sound. |
What is the story of reflective properties of a surface? | acoustics |
When a wave that is traveling at an angle changes its speed upong a crossing boundary between two medias, what happens? | it bends |
What do plane mirrors only produce? | a virtual image |
When are sound waves refracted? | when parts of a wave front travel at different speeds. |
What causes refraction? | When there are changes in the speed of light, as it passes from one medium to another, or variations in the temperatures and densities of the same meadium. |