Question
if ω1 &ω2 are dispersive powers of lenses of focal length f1 & f2 respectively . then the condition of chromatic aberration for two lenses in contact is
1) ω1/ω2 = f2/f1
2) ω1/ω2 = f1/f2
3) ω1/ω2= - f1/f2
4) ω2/ω1= f1/f2
Joshi sir comment
3 is the true condition and can be proved