Shared Flashcard Set

Details

Color, Light, Lenses, Reflection, Refraction
N/A
24
Physics
04/21/2010

Term
 Primary Color Wheel of Light (additive)
Definition
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Term
 Primary Color Wheel of Pigment (subtractive)
Definition
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Term
 Arrangement of the EMS
Definition
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Term
 Why is the sky blue?
Definition
 Particles in the air scatter light Smaller the particle, vibrates @ higher frequency (blue/violet) We see blue because our eyes are more sensitive to blue than to violet
Term
 Why are clouds white?
Definition
 Clouds have differnt sizes of droplets = scatter all frequencies of light = white
Term
 Why is the sea green/blue?
Definition
 Reflection of the sky
Term
 Refraction
Definition
 The bending of light as it goes from one medium to another. Occurs when waves are forced to travel faster or slower due to a change in a medium.
Term
 Reflection
Definition
 Reflection of light occurs when light bounces off a surface.
Term
 Specular & Diffuse Reflection   Diffuse-When light strikes a rough surface and is reflected in many directions. Specular- The surface is smooth, that is, the irregularities in the surface are small compared to the wavelength of the light. The light reflects as one beam.
Definition
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Term
 Dispersion Separation of light into colors arranged according to their frequency.
Definition
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Term
 Diffraction The bending of rays by means other than reflection or refraction.
Definition
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Term
 Lunar Eclipse When the Earth passes between the moon and the sun.
Definition
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Term
 Solar Eclipse When the moon passes between the Earth and the sun.
Definition
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Term
Definition
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Term
 Total Internal Reflection There is anangle at which the light will reflect rather than refract. This is called the critical angle - the beam will experience total internal reflection.
Definition
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Term
 Holograms 3D pictures created through the interference of two parts of a laser beam.
Definition
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Term
 Iridescence Caused by destructive interference of different frequencies at different thicknesses.
Definition
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Term
 Lenses
Definition
 A converging lens causes parallel rays to cross. Used for cameras, telescopes, compound, microscopes, magnifying glasses, and to correct farsightedness. A diverging lens causes parallel rays to separate. Used for peepholes in doors or viewfinders in cameras, and to correct nearsightedness.
Term
 Image Types
Definition
 Mirrors create a virtual image – does not have light originating from it Real Image - An image that has light originating from it and can be projected on a wall after it has passed through a lens or reflected off a mirror. Virtual images cannot be focused on a screen.
Term
 Mirrors
Definition
 Convex – curves outward,forms a virtual image that appears smaller and closer to the mirror than the object actually is. Concave – curves inward, forms a virtual image that appears larger and farther away than the object is.
Term
 Lasers  A beam of light that has the same frequency, phase, and direction. Also called coherent light
Definition
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Term
 Nearsightedness The eyeball is too long and distant objects are focused too near the lens, in front of the retina. Corrected with a diverging lens.
Definition
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Term
 Farsightedness The eyeball is too short and the image is produced behind the retina. Corrected with a converging lens.
Definition
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Term
 Astigmatism If the curvature of the eye varies, the image will not form properly. It will not be sharp.
Definition
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