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Light and the electromagnetic spectrum Typeit
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When drawing ray diagrams, a line is used to show a ray of light and an arrow is used to show the direction in which the ray is travelling. When a ray hits a boundary and reflects, the incoming ray with its arrow pointing towards the boundary is called the ray, and the ray with the arrow pointing away is the ray. The angles these rays make with the normal to the surface are called the angle of and the angle of , respectively. The law of reflection states that these angles are .
The properties and applications of electromagnetic waves depend on their wavelengths. The electromagnetic spectrum is grouped into different regions from the longest wavelength group, , to the shortest wavelength group, . The human eye can see wavelengths of approximately 380 nm to 740 nm. Lenses are used to change the direction of light. lenses focus light rays into a single point. lenses cause light rays to move away from each other.
All objects absorb and emit radiation. A absorbs and re-emits all the radiation incident on it.
Atoms can interact with electromagnetic waves. Atoms can either absorb or radiation in the electromagnetic spectrum. If a wave hits an atom, it can cause an electron to move up to a energy level. When that falls back to its original energy level, radiation is given out.