Two lenses have focal lengths `f_(1)` and `f_(2)` and their dispersive powers are `omega_(1)` and `omega_(2)` respectively. They will together form an
Two lenses have focal lengths `f_(1)` and `f_(2)` and their dispersive powers are `omega_(1)` and `omega_(2)` respectively. They will together form an achromatic combination if
A. `omega_(1)=2omega_(2) and f_(1)=2f_(2)`
B. `2omega_(1)=omega_(2) and f_(1)=2f_(2)`
C. `omega_(1)=2omega_(2) and f_(1)=-2f_(2)`
D. `2omega_(1)=omega_(2) and 2f_(1)=f_(2)`
4 views
1 Answers
Correct Answer - C
(c ) Coordinate of achromatic combination is satisfied, if
`omega_(1)/(f_(1))+omega_(2)/(f_(2))=0`
4 views
Answered