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Light and Reflections
Students will be able to Compare different types of reflectionContrast different types of mirrorsUnderstand index of reflectionContrast different types of lenses
Page 113
Reflections
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Reflection of Light Rays
Ray – Straight line wave to represent light
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Reflection of Light Rays
Two types of ReflectionRegular
Light hits a smooth surfaceAll rays reflected at same angleSharp image
DiffuseUneven surfaceEach ray reflects differently
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Two Types
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Plane Mirrors
Flat sheet of glass with a smooth silver coatingWhat you see in mirror is virtual image
Appears to be behind the mirrorSame size and uprightRight and left sides are reversed
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Plane Mirror
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Concave Mirrors
A mirror with a surface that curves inward like a bowl
Optical axis =Imaginary line that cut mirror in half
Focal point = Point where rays meetThe more curved then the closer the focal point
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Concave Mirrors
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Concave Mirrors
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Concave Mirrors
Real image is produced when rays meetAlways upside downCan be larger or smaller
Virtual image if inside focal pointAlways right side upAlways larger
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Concave Mirrors
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Convex Mirrors
Mirror curves outwardAlways virtual imageAlways smaller
Used in side mirrors of cars Picture large world in small mirrorProblem is that everything is small
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Convex Mirrors
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Refraction
Light waves bend when they enter a new medium at an angle
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Index of Refraction
Measure of how much light bendsThe higher the number the more it bends light
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Prisms and Rainbows
Longer wavelength bends least (red on top)Short wavelength bends more (violet on bottom)
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Mirages
Temperature changes will cause light to change speed (light wave moves faster in when hot)
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Lenses
Lens = Curved piece of glass to refract light
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Convex LensThicker in the center than the edges
Can produce virtual or real images depending on location
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Convex Lens
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Concave Lens
Thicker on the edges than in the middleOnly virtual images
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Quiz
Homework
Describe one type of mirrors and one type of lens