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show the final formula to solve for each variable

See the attached file.
E = illumination
r = distance
I = intensity
Illumination:
Given the formula for E, show the final formula to solve for each of the following variables:
r =
I =

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n = index of refraction
v = speed of light in a substance
c = speed of light in a vacuum
Index of Refraction:
Given the formula for n, show the final formula to solve for each of the following variables:
c =
v =
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Mirrors:
Given the formula for 1/f, show the final formula to solve for each of the following variables:
do = object distance
di = image distance
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Mirrors:
Given the formula for M, show the final formula to solve for each of the following variables:
hi =
ho =
di =
do =?

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Solution Summary

The solution shows the final formula to solve for each variable given the equation.

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