Physics crossword

2. A small breach on a surface
4. The line that marks the limits or edges of something and separates it from other things or places
5. A smooth surface on which regular reflection takes place
7. A state, or the production of a state, in which rays of light or similar radiation exhibit different properties in different directions
10. The electromagnetic radiation within a certain portion of the electromagnetic spectrum
12. The point on a wave with the greatest positive value or upward displacement within a cycle
14. The change of direction of a ray or a wave after bumping into a barrier or a surface
16. The number of complete vibrational cycles of a medium per a given amount of time
17. The time for a particle on a medium to make one complete vibrational cycle, or in other words, one complete oscillation. According to I.S. it is measured in seconds
18. The position of a point in time on a waveform cycle

1. An attribute of things that result from the light they reflect, transmit or emit in so far as this light causes a visual sensation that depends on its wavelenght
3. The imaginary surface representing corresponding points of a wave that vibrates in unison
6. The combination of two or more waves trains moving on intersecting or coincident paths
8. The line perpendicular to the boundary passing through the point of incidence
9. A substance that makes possible the transfer of energy from one location to another, especially through waves
11. A space devoid of matter
13. A natural or artificial process that emits a visible electromagnetic radiation
15. The magnitude, thus a scalar quantity, of the rate of change of an object's position
17. The transparent optical element with flat and polished surfaces and it is mostly used to disperse light
18. The distance travelled by a wave in a specified context