RAY DIAGRAMS Steps for drawing a plane mirror ray diagram: 1. A ray that strikes perpendicular to the mirror surface, reflects perpendicular to the mirror.

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Learning Outcome Draw a ray diagram to find the position, nature and size of the image produced by a concave and convex mirrors.

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Presentation transcript:

RAY DIAGRAMS Steps for drawing a plane mirror ray diagram: 1. A ray that strikes perpendicular to the mirror surface, reflects perpendicular to the mirror. This reflected ray is extended behind the mirror 2. A ray that strikes the mirror at any angle reflects so that the angle of incidence equals the angle of reflection; the reflected ray is extended behind the mirror.

MIRROR

Ray diagrams for concave mirrors: There are three principal rays. You may locate an image using any two of the principal rays. 1. A ray incident upon the mirror that is parallel to the principal axis, reflects through the focus. 2. A ray incident upon the mirror that passes through the focus, reflects parallel to the principal axis. 3. A ray that connects the top of the object and the center of curvature reflects back upon itself.

CONCAVE MIRROR

Ray Diagrams for convex mirrors: There are three principal rays. You may locate an image using any two of the principal rays. 1. A ray incident on the mirror that is parallel to the principal axis is reflected in a line even with the focus (extend the reflected ray behind the mirror so that it passes through the focus). 2. A ray incident on the mirror that passes through the focus is reflected parallel to the principal axis (extend the reflected ray behind the mirror parallel to the principal axis). 3. A ray that connects the top of the object and the center of curvature reflects back upon itself.

CONVEX MIRRORS

Instructions for creating ray diagrams for lenses: 1. A ray passing through the optical center of the lens passes through unrefracted. 2. A ray incident upon the lens parallel to the principal axis passes through the focus; convex lenses use the focus on the opposite side of the lens and concave lenses use the focus on the same side of the lens.

Instructions for creating ray diagrams for lenses: The following is true for a double convex lens: 3. Any incident ray traveling parallel to the principal axis of a converging lens will refract through the lens and travel through the focal point on the opposite side of the lens. 4. Any incident ray traveling through the focal point on the way to the lens will refract through the lens and travel parallel to the principal axis. 5. An incident ray which passes through the center of the lens will in effect continue in the same direction that it had when it entered the lens.