Gr.10 Physics - Reflection: Plane Mirrors

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Textbook: 10.2

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8 Terms

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Law of Reflection:

angle of incidence = angle of reflection

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Normal

  • Perpendicular to the point of incidence(vertex).

  • Angles are always measured from the normal.

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Image

  • Reproduction of an object

  • Produced by an optical device which is any technology that uses light(eg. mirror, lens)

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Virtual Images

  • Cannot be visually projected on a screen.

  • Formed by light coming from an apparent(not real) light source.

  • Always upright

  • Appears behind mirror

  • Images on plane mirrors are always virtual

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SALT

Size: compared to the original object is it the same size?

Attitude: which way is the image oriented compared to the original object.

Location: location of the image (in front or behind mirror)

Type: is the image a real or virtual image?

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Plane Mirror Images SALT

S: object size = image size

A: ALWAYS upright

L: object distance from mirror = image distance from mirror

T: virtual image —> image is reversed (left to right)

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Steps for finding an image in a Plane Mirror using Ray Diagrams

  1. Draw a ray from the object that strikes perpendicular to the mirror surface(a normal). The virtual ray extends into the mirror the same distance.

  2. Draw a ray that strikes the mirror at any angle and reflects so the angle of incidence = the angle of reflection. Extend the virtual ray into the mirror.

  3. Where these two ray meet is the part of the object that appears as a virtual image.

  4. Repeat for all points of the object

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Plane mirror

Mirror with a flat, reflective surface.