why u is always negative in lens formula where u is equal to object which should be in plus
Dear Student
u is always negative because according to lens principle if direction is opposite to that of direction of ray than it is negative otherwise if it is in direction of ray than than it is positive.
Regards
u is always negative because according to lens principle if direction is opposite to that of direction of ray than it is negative otherwise if it is in direction of ray than than it is positive.
Regards