Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

45 Cards in this Set

  • Front
  • Back
a transparent object that uses the property of refraction to magnify or reduce images
electromagnetic magnetic waves
energy in wave form that is capable of traveling through a vacuum: radio waves, microwaves, etc.
principal focus
a point through which the rays reflected or refracted from a surface will pass
mechanical waves
rhythmic disturbances of a medium: sound waves, water waves, etc.
constructive interference
the inphase reinforcement of waves as they pass through each other
hertz (Hz)
the unit of frequency; one cycle per second
the number of waves that pass a given point in one second
a very large number of individual light waves
concave mirrors
a mirror that curves like the inner surface of a sphere
an imaginary line drawn perpendicular to the surface of a mirror
X rays
electromagnetic waves with frequencies higher than ultraviolet light; strong enough to penetrate body tissues
transverse wave
a wave whose vibration is at right angles to the direction in which it is traveling
the distance that a wave rises or falls from its normal rest position
electromagnetic waves with wavelengths from 0.3 cm to 30 cm, and with frequencies that range from 10(9) Hz to l0(11) Hz.
the distance between adjacent troughs or peaks
subtractive primary colors
yellow, cyan, and magenta; when they are mixed in various proportions, they absorb all other colors except the one that is reflected. When all three are mixed together, they absorb every color, showing black.
line spectrum
a display of the various frequencies of light emitted by a source
the separation of white light into different-colored light waves
heated to glowing
reflected ray
an outgoing ray (away from the reflecting surface)
radio waves
electromagnetic waves with wavelengths between 1 and 10 m long and with frequencies below those of visible light waves
the lowest point on a wave
representations of the directions of light waves
plane mirror
a flat mirror
longitudinal wave
a wave whose vibration is in the same direction that it is traveling
a triangular block of glass that is used to separate visible light into various colors
destructive interference
the out-of-phase cancellation of waves as they pass through each other
radio detection and ranging devices that detect objects through the transmission and reflection of microwaves off of surfaces
incident ray
an incoming ray (toward the reflecting surface)
real image
an image that is produced in front of the plane of a mirror
the highest point on a wave
virtual images
the images that appear to exist beyone a mirror
gamma rays
a form of radiation consisting of high-energy electromagnetic waves; electromagnetic waves that originate in the nucleus of an atom; the type of electromagnetic waves with the highest frequencies
angle of reflection
the angle between the reflected ray and the normal
visible light
electromagnetic waves with wavelengths ranging from 4 x 10(-1) cm to 7 x 10(-5) cm, and with frequencies ranging from 4.5 x 10(14) Hz to 7.5 x 10(14) Hz; the portion of radiant energy that can be sensed by our eyes
ultraviolet light
electromagnetic waves that are just beyond visible light in frequency
the rate at which an object changes position in a specified direction
the metric unit of light intensity
additive primary colors
red, green, blue; form various colors when mixed in different proportions. When all three are mixed, they reflect white
infrared waves
electromagnetic waves with frequencies lower than visible light but greater than radio waves
focal length
the distance from a lens to its principal focus
the measure of how bright the light from a light source is or the loudiness of sound
angle of incidence
the angle between the incident ray and the normal
law of reflection
the angle of incidence must be equal to the angle of reflection
the bending of waves as they pass from one medium into another