Text of Ch. 14 Light and Reflection. Flat Mirrors Simplest mirror Object’s image appears behind the mirror...

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Ch. 14 Light and Reflection

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Flat Mirrors Simplest mirror Objects image appears behind the mirror Objects distance from the mirror is represented as p Image distance (the distance the object appears behind the mirrors surface) is represented a q

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The image formed in the mirror is called a virtual image (upright) The image of the object and the object are the same size p = - q

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Curved Mirrors The amount by which the mirror is curved determines how large the image will be. The mirror is part of a spherical shell.

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The radius of the curvature of the mirror is known as R R is the distance from the mirrors surface to the center of the curvature, C. Principle axis the line that extends infinitely from the center of the mirrors surface through the center of the curvature, C

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Focal point (F) an image point between the center of the curvature and the center of the mirrors surface f = focal length distance between the focal point and the mirrors surface.

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Image location can be predicted with the mirror equation.

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Magnification (M) the ratio of the height of the image to the objects actual height. M > 1image is larger than object M = 1image and object are same size M < 1image is smaller than object

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Convex Mirrors Diverging mirror Used in side view mirrors, roadway mirrors and in stores

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q is always negative f is always negative The object is always virtual image (upright) larger than the image

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An upright pencil is placed in front of a convex spherical mirror with a focal length of 8.00 cm. An image 2.50 cm tall is formed 4.44 cm behind the mirror. Find the position of the object, the magnification of the image, and the height of the pencil.

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An upright pencil is placed in front of a convex spherical mirror with a focal length of 8.00 cm. An image 2.50 cm tall if formed 4.44 cm behind the mirror. Find the position of the object, the magnification of the image, and the height of the pencil.