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Light & Optics
Physics Finals Review
| Question | Answer |
|---|---|
| What type of wave is light? | Transverse |
| What constant speed does light travel by in a vacuum? | 3.00 x 10^8 |
| When light waves travel from one medium to another, the speed changes but the frequency what? | Stays the same |
| The EM spectrum travels at the same what? | Speed |
| What is the visible light wavelength range? | 400 to 700nm |
| What is the EM spectrum order? | Radio, Microwave, Infrared, Visible, Ultraviolet, X-Ray, Gamma Rays |
| What is the EM spectrum color order? | Red, Orange, Yellow, Green, Blue, Indigo, Violet |
| Define plane reflection | Reflection off a smooth surface |
| Define diffuse reflection | Reflection of light into many directions by rough surfaces |
| Define law of reflection | The angle of incidence is equal to the angle of reflection |
| In ALL optics problems, the angles are measured from the normal to what? | Point of incidence |
| Natural light vibrates in what direction? | Everywhere |
| Polarized light vibrates in one specific what? | Plane |
| What color is the result of the combination of all colors of the visible light spectrum? | White |
| What are the three primary colors of light? | Red, green, and blue |
| What are the three secondary colors of light? | Yellow, magenta, and cyan |
| Define dispersion | The spreading out of light according to color |
| Define index of refraction | The ratio of the speed of light in vacuum compared to the speed of light in the medium |
| Define coherent | Waves maintain a constant phase relationship (crests stay matched up with crests for instance) |
| Define incoherent | Phase relationship varies randomly; This type of light includes incandescent and fluorescent bulbs |
| Define monochromatic | Light of a single color and frequency |
| The higher the frequency of an electromagnetic wave, the more what? | Energy it transmits |
| The color of light depends on the light wave’s what? | Wavelength |
| Longest wavelength | Red |
| Shortest wavelength | Violet |
| Define diffraction | A bending, interfering, and pattern forming effect that results when light passes through thin slits (or openings) in opaque barriers |
| Define incident ray | The ray that shines on the mirror |
| Define reflected ray | The ray that reflects from the mirror |
| Define normal | An imaginary line perpendicular to the mirror’s surface |
| Define angle of incidence | The angle between the normal and the incident ray |
| Define angle of reflection | The angle between the normal and the reflected ray |
| When light rays enter a material in which their speed decreases, the rays bend... | Toward the normal |
| When light rays enter a material in which their speed increases, the rays bend... | Away from normal |
| A real image is what? | Inverted |
| Define converging lens | Thicker in the middle, causing parallel rays to meet at the focal point. |
| Define diverging lens | Thinner in the middle, causing parallel rays to bend away from the focal point |
| Define focal length | The distance between the center of the lens and its focal point |
| A converging/convex lens forms either what? | A real or a virtual image |
| When the object is between the focal point and a converging/convex lens, the image is what? | Virtual |
| When the object is farther from a converging/convex lens than the focal point, the image is what? | Real |
| A diverging/ concave lens always forms a what? | Virtual image |
| Ray diagrams are used to determine what? | Size and location of an image |
| An arrow is used to represent the what? | Object |
Created by:
nynystylz
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