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Published byMadeline McDonough Modified over 5 years ago

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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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**Plane Mirrors Eye sees image back here**

Image is virtual and laterally inverted Light from object reflects into eye

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**Curved (Concave) Mirrors**

F P c pa f P = pole , pa = principal axis C = centre of curvature, c = radius of curvature F = Focal point or focus, f = focal length f = c / 2

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Ray Diagrams Rule 1: An incident ray parallel to the pa is reflected back through the focal point. F

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Ray Diagrams Rule 2: An incident ray that passes through the focal point on the way to the mirror is reflected back parallel to the pa. F

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Ray Diagrams Rule 3: An incident ray headed towards the pole reflects back at an equal angle P F

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**All three combined allow you to find the image **

In this example the image is inverted, diminished and real object F P image

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Concave Mirrors Concave (or converging) mirrors focus light at the focal point. F

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**Convex Mirrors Convex mirrors have a focal point behind the mirror.**

Convex (or diverging) mirrors spread the light rays apart so that they appear to have come from the focal point F

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**Ray Diagrams The same rules can be applied to convex mirrors…**

All convex mirror images are virtual. object F image

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