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Lights and Lasers Test Crossword
Down
:
1) distance between one point on a wave and the nearest point just like it
2) optical telescope that uses a double convex lens to bend the light and form an image at the focal point
3) point on the optical axis of a mirror or lens where rays traveling parallel to the optical axis pass through
5) optical telescope that uses a concave mirror to focus light and form an image at the focal point
7) electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves
9) device for amplifying light and focusing it into an intense beam
12) lens that is thicker at its edges than in the middle
13) number of wavelengths that pass a fixed point each second; expressed in hertz(Hz)
15) electromagnetic waves with wavelengths that can be detected by human eyes
17) particle that electromagnetic waves sometimes behaves like; has energy that increases as the frequency of the electromagnetic waves increase
Across
:
4) when a wave is reflected, the angle of incidence is equal to the angle of reflection
6) bending of a wave as it changes speed in moving from one medium to another
8) light waves bounce off a surface back to the light source
10) degree to which something can be magnified
11) arrangement of electromagnetic waves according to their wavelengths
14) lens that is thicker in the middle than at its edges
16) material through which a wave travels
18) type of energy that comes to Earth from the Sun; can damage skin and cause cancer
19) narrow beam of light traveling in a straight line
20) transparent object that has at least one curved surface that causes light to bend
21) distance along the optical axis from the center of a mirror or lens to the focal point
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