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reflection+mirror3

# reflection+mirror3 - Geometric optics Light reflects on...

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1 Geometric optics Light reflects on interface of two media, following the law of reflection: i r θ θ = Incident light Normal of the interface Reflected light with respect to the normal of the interface. with respect to the normal of the interface.

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2 Planar mirror The image of an object in front of a planar (flat) mirror: On the other side of the mirror. The image distance d i equals the object distance d o. The image has the same height as the object, right side up and virtual. Concept question: when you look into a flat mirror at your image, it seems that your left and right are reversed (you raise your right hand, your image seems to raise its left hand), but not up and down (your image is still up right). If you rotate the mirror about the plane’s normal direction, your image does not rotate at all. It seems that the plane mirror has an axial symmetry about its normal direction. Then why the mirror treat left/right differently than up/down? Class discussion.
3 Planar mirror The full length mirror question asked again: Asked: what is the minimum length of this mirror for the penguin to see her full height? Asked again: what is the minimum length of this mirror for you to the penguin of her full height in the mirror?

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4 Spherical mirror Focal point and focal length with respect to the sphere center and its radius Concave mirror Convex mirror 2 R f = 2 R f - = A V 1 2 3 Prove: 1 = 2 = 3, so CF = FA. When A is very
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