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Light Reflection and Refraction
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17/08/2021 12:11 pm
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Write the formula for a lens connecting image distance (υ), object distance (u)and the focal length (f). How does the lens formula differ from the mirror formula?
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17/08/2021 12:15 pm
Formula for a lens connecting image distance (v), object distance (u) and the focal length (f) is:
\(\frac{1}{v}\) - \(\frac{1}{u}\) = \(\frac{1}{f}\)
This is the lens formula.
The lens formula has a minus sign(-) between \(\frac{1}{v}\) and \(\frac{1}{u}\) whereas the mirror formula a has plus sign(+) between \(\frac{1}{v}\) and \(\frac{1}{u}\).
Mirror formula:
\(\frac{1}{v}\) + \(\frac{1}{u}\) = \(\frac{1}{f}\)