# 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.
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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 http://www.physics.uoguelph.ca/applets/Intro_physics/kisalev/java/totintrefl/index.html
• 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
• Recommended

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