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lect5416

# lect5416 - Formation of Images by Spherical Mirrors For an...

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Formation of Images by Spherical Mirrors

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For an object infinitely far away (the sun or starts), the rays would be precisely parallel .

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If a mirror is small compared to its radius of curvature, so that the reflected rays make only a small angle upon reflection, then the rays will cross each other at a single point, or focus .

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The principal axis of a mirror is defined as the straight line perpendicular to the curved surface at its center.
The point F, where the rays parallel to the principal axis, come to a focus, is called the focal point of the mirror.

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The distance between focal point and the center of the mirror is called the focal length, f , of the mirror.
Another way of defining the focal point is to say that it is the image point for an object infinitely far away along the principal axis.

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Finding the Image Position for a Curved Mirror
- ray 1 is drawn parallel to the axis; therefore it must pass along a line through F; - ray 2 is drawn through F, as result is must reflect into parallel to the principal axis ray;

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lect5416 - Formation of Images by Spherical Mirrors For an...

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