Angle of incidence equals angle of reflection (UEB uncontracted)

By: Rnib

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Synopsis: This page shows a ray of light hitting a flat (plane) mirror at an angle and being reflected at the same angle. The diagram is labelled. There is a locator dot shown, which will be at the top left of the page when the image is the correct way up. The mirror is seen in vertical cross section just to left of the centre of the page. The heavy vertical line represents its reflective surface. There is a dashed horizontal line, labelled normal, passing through the centre of the mirror. A line of arrows, representing an incident light ray, is going diagonally up and right from the bottom centre of the page. It hits the mirror at the normal line and is reflected up and left to the top centre of the page. An arc goes from the arrow at the bottom of the page, through the normal line, to the arrow at the top. This marks the angles of incidence and reflection. You can measure these angles by placing the centre of a protractor where the plane of the mirror crosses the normal line.

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