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ICSE - IX - Physics - Spherical Mirrors

derive the mirror equation

Asked by 9th January 2012, 3:47 PM
Answered by Expert


Sign convention and symbols
We use the same sign convention and symbols that we use with lenses to refer to the principle points of curved mirrors. This simplifies the mathematical equations.

By tracing the principle rays, we see pairs of similar triangles.

Mirror equation:
Using the similar triangles GHF and VEF:

Equation 1

and similar triangles ABV and GHV:

Equation 2

Since AB = EV, then

We can combine Equations 1 and 2:

Divide both sides by di:

and rearrange, giving us the Mirror Equation:


Magnification Equation:
Using similar triangles ABV and GHV again:

By assigning a negative value to the inverted image, we have the Magnification Equation

Answered by Expert 10th January 2012, 9:56 AM

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