how to find u and v where f is known and m is also known i need the formula tomorrow is sci exam plzzz help ... i need it for both lens and mirror

dear student
We have two formulas as
for focal length 1f=1u+1vand magnification m=-vuby solving these two equations we can get u and v.Regards

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for mirrors-
1/f = 1/v + 1/u

m = -v/u

for lenses-
1/f = 1/v - 1/u

m = v/u

with these formulae, you will get two eqations in each case. solve them further to get your solution.

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