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Light And Reflections

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Highline Academy

This document discusses different types of reflections and refractions of light. It compares and contrasts plane mirrors, concave mirrors, and convex mirrors. Plane mirrors produce virtual images that are the same size and reversed left and right. Concave mirrors can produce real or virtual images, depending on if the light rays meet inside or outside the focal point. Convex mirrors always produce smaller, virtual images. The document also discusses refraction through lenses and prisms, comparing convex and concave lenses and how they can produce real or virtual images based on the light ray locations. It introduces key terms like optical axis, focal point, and index of refraction.

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Light and Reflections Students will be able to Compare different types of reflection Contrast different types of mirrors Understand index of reflection Contrast different types of lenses Page 113
Reflections 114
Reflection of Light Rays Ray – Straight line wave to represent light 114
Reflection of Light Rays Two types of Reflection Regular Light hits a smooth surface All rays reflected at same angle Sharp image Diffuse Uneven surface Each ray reflects differently 114
Two Types 114
Plane Mirrors Flat sheet of glass with a smooth silver coating What you see in mirror is virtual image Appears to be behind the mirror Same size and upright Right and left sides are reversed 115
Plane Mirror 115
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 meet The more curved then the closer the focal point 116
Concave Mirrors 116
Concave Mirrors 116
Concave Mirrors Real image is produced when rays meet Always upside down Can be larger or smaller Virtual image if inside focal point Always right side up Always larger 117
Concave Mirrors 117
Convex Mirrors Mirror curves outward Always virtual image Always smaller Used in side mirrors of cars Picture large world in small mirror Problem is that everything is small 118
Convex Mirrors 118
Refraction Light waves bend when they enter a new medium at an angle 120
Index of Refraction Measure of how much light bends The higher the number the more it bends light 120
Prisms and Rainbows Longer wavelength bends least (red on top) Short wavelength bends more (violet on bottom) 121
Mirages Temperature changes will cause light to change speed (light wave moves faster in when hot) 121
Lenses Lens = Curved piece of glass to refract light 122
Convex Lens Thicker in the center than the edges Can produce virtual or real images depending on location 122
Convex Lens 122
Concave Lens Thicker on the edges than in the middle Only virtual images 122
Quiz
Homework Describe one type of mirrors and one type of lens

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Light And Reflections