Ch. 17 Reflection and Refraction

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Ch. 17 Reflection and Refraction. Milbank High School. Sec. 17.1 How Light Behaves at a Boundary. Objectives Explain the law of reflection Distinguish between diffuse and regular reflection and provide examples Calculate the index of refraction in a medium. The Law of Reflection.
Ch. 17 Reflection and Refraction Milbank High School Sec. 17.1How Light Behaves at a Boundary
  • Objectives
  • Explain the law of reflection
  • Distinguish between diffuse and regular reflection and provide examples
  • Calculate the index of refraction in a medium
  • The Law of Reflection
  • Smooth Surfaces
  • Mirrors
  • Angle of incidence = angle of reflection
  • Seemingly smooth surfaces
  • Walls
  • Paper
  • Actually rough surfaces
  • Light waves result in diffuse reflection
  • Refraction of Light
  • Refraction
  • Change in direction or bending of light at the boundary of two media
  • Plastics, glass
  • Optically dense materials
  • If angle of refraction is smaller than the angle of incidence
  • Snell’s Law
  • The degree of refraction depends on angle of incidence and properties of the medium
  • Snell’s Law
  • Ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant
  • Index of Refraction and the Speed of Light
  • Index of refraction
  • Measure of how much light bends in a new medium
  • It bends because of a change in speed
  • Index of refraction nsubstance = c/vsubstance
  • Review Questions
  • Could the index of refraction ever be less that 1?
  • What behaviors does light exhibit?
  • Sec. 17.2Applications of Reflected and Refracted Light
  • Objectives
  • Explain total internal reflection
  • Define the critical angle
  • Explain effects caused by the refraction of light in a medium with varying refractive indices
  • Explain dispersion of light in terms of the index of refraction
  • Total Internal Reflection
  • Occurs when light passes from a more optically dense medium to a less optically dense medium at an angle so great that there is no refracted ray
  • Critical angle
  • The incident angle that causes the refracted ray to lie right along the boundary of the substance, angle Θc sin Θc = nr/ni
  • Effects of Refraction
  • Mirages
  • Index of refraction changes in hot air vs. cool air
  • Sunlight after the sun has set
  • Index of refraction changes due to the change in density of the atmosphere
  • Dispersion of Light
  • Separation of light into its spectrum
  • Happens as light travels through a prism
  • Glass
  • Diamonds
  • Water
  • Red bent the least
  • Violet bent the most
  • Rainbows
  • Spectrum formed when sunlight is dispersed by water droplets in the atmosphere
  • In afternoon, only see rainbows to the east
  • White light separates into different colors (wavelengths) on entering the raindrop because red light is refracted by a lesser angle than blue light. On leaving the raindrop, the red rays have turned through a smaller angle than the blue rays, producing a rainbow.
  • Sun Dog
  • Refraction of sunlight by ice crystals
  • Cirrus or cirrostratus clouds
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