Across
- 2. of reflection the angle made by a reflected ray with a perpendicular to the reflecting surface.
- 5. are materials that conduct electricity with zero resistance below a certain temperature.
- 7. an elementary particle, the quantum of light and all other forms of electromagnetic radiation
- 9. current is an electric current in which the flow of electric charge periodically reverses direction, whereas in direct current (DC, also dc), the flow of electric charge is only in one direction.
- 10. lens is a converging lens. When parallel rays of light pass through a convex lens the refracted rays converge at one point
- 13. Spectrum the range of wavelengths or frequencies over which electromagnetic radiation extends
- 16. angle is the angle of incidence above which the total internal reflection occurs
- 18. lens is a lens that possesses at least one surface that curves inwards
- 19. force A magnetic field is the magnetic effect of electric currents and magnetic materials
- 20. wave is a mechanical wave that propagates along the interface between differing media, usually as a gravity wave between two fluids with different densities
Down
- 1. the process or action of bringing about or giving rise to something.
- 3. a long, narrow, open container for growing plants or mixing chemicals
- 4. wave that is an oscillation of matter, and therefore transfers energy through a medium
- 6. waves are waves which can travel through the vacuum of outer space. Mechanical waves, unlike electromagnetic waves, require the presence of a material medium in order to transport their energy from one location to another.
- 8. a container consisting of one or more cells, in which chemical energy is converted into electricity and used as a source of power.
- 11. is a type of magnet in which the magnetic field is produced by an electric current
- 12. Point (optics) the point at which rays or waves meet after reflection or refraction, or the point from which diverging rays or waves appear to proceed.
- 14. charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field.
- 15. pole any magnet is the one that would be attracted to the Earth's North magnetic pole. In that sense, they are just labels that identify the opposite magnetic force produced at each end of the magnet.
- 17. an electromotive force or potential difference expressed in volts.
- 21. of incidence the angle that an incident line or ray makes with a perpendicular to the surface at the point of incidence