# Shared Flashcard Set

## Details

Phenomena of Nature
Light and Sound
26
Physics
04/06/2009

Term
 Categories of electromagnetic energies, from shortest to longer wavelength
Definition
 TV/Radio, Microwave, Infrared, Visible, Ultraviolet, X-Ray, Gamma
Term
 Red + Green =
Definition
 Yellow
Term
 Red + Blue =
Definition
 Magenta
Term
 Green + Blue
Definition
 Cyan
Term
 Yellow + Magenta =
Definition
 Red
Term
 Yellow + Cyan =
Definition
 Green
Term
 Magenta + Cyan =
Definition
 Blue
Term
 Four Ways Light Interact with Matter
Definition
 Emission, Absorption, Transmission, Reflection
Term
 Specular reflection
Definition
 Reflection from a smooth surface at a definite angle
Term
 Diffuse reflection
Definition
 Reflection from a rough surface, very scattering
Term
 Law of Refraction
Definition
 Light beam is bent toward the normal when it passes into a medium with a higher Index of Refraction (one wheel passes from grass to pavement.) It bends away from the normal when it passes into a medium with a lower Index of Refraction (one wheel on the grass.)
Term
 Index of Refraction
Definition
 n=Speed of light in a vacuum/Speed of light in a medium
Term
 Law of Reflection
Definition
 Angle of Incidence is equal of the Angle of Reflection
Term
 What is total internal reflection?
Definition
 Only occurs when light passes from medium with higher Index of Refraction to one of lower Index of Refraction. ray of light strikes a medium boundary at an angle larger than the critical angle with respect to the normal to the surface. The critical angle is the angle of incidence above which total internal reflection occurs.
Term
 Dispersion
Definition
 Speed of light is wavelength dependent.Index of Refraction is a function of wavelength.Light is dispersed into a spectrium in a process called dispersion.
Term
 Which color of the rainbow has the highest Index of Refraction in glass?
Definition
 Violet
Term
 Dispersion through a prism is dependent on
Definition
 Angle between the two surfacesDirection of incidence on the first facePrism's index of refraction
Term
 How is a rainbow created?
Definition
 Water is more dense than air, so light is refracted as it enters and leaves each drop. Red light is bent less (40 degrees), Blue light more (42 degrees), as in a prism.In each drop, some light will have internal reflection.Each raindrop only contributes one color. Raindrops lower down contribute blue and green. Raindrops higher up contribute red and yellow.
Term
 What is the antisolar point?
Definition
 The point where the sun is directly opposite of us. Line of antisolar point is the centerpoint around which a rainbow forms. If the sun is in the sky, the antisolar point is below the horizon. If the sun has set, the antisolar point is above the horizon. Indicates direction of sun and where a rainbow might form.
Term
 Characteristics of a converging lens
Definition
 Convex surface with a positive focal length. Forms a real image.
Term
 Optical axis
Definition
 axis normal to both sides of lens. Light is not refracted along optical axis.
Term
 Focus
Definition
 The point where light rights parallel to the optical axis converge. Focus of a lens is found on opposite side of lens from object.
Term
 Focal length
Definition
 Distance from centerline of lens to focus.
Term
 Diverging lenses
Definition
 Concave lense with negative focal length. Forms a virtual image.
Term
 Correction for myopia (image unfocused in front of retina)
Definition
 Diverging lens
Term
 Correction for hyperopia (far-sightedness; image focused behind retina)
Definition
 Converging lens
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