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 Share with your friends Share 0 Sanjay Upadhyay answered this 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 0 View Full Answer Shailja Tripathi answered this for mirrors- 1/f = 1/v + 1/u m = -v/u for lenses- 1/f = 1/v - 1/u m = v/uwith these formulae, you will get two eqations in each case. solve them further to get your solution. HOPE IT HELPS.... 0
