|
The two lenses of an achromatic doublet should have |
|
|
a) |
Equal powers |
|
b) |
Equal dispersive powers |
|
c) |
Equal ratio of their power and dispersive power |
|
d) |
Sum of the product of their powers and dispersive power equal to zero |
|
The two lenses of an achromatic doublet should have |
|
|
a) |
Equal powers |
|
b) |
Equal dispersive powers |
|
c) |
Equal ratio of their power and dispersive power |
|
d) |
Sum of the product of their powers and dispersive power equal to zero |
|
(d) The two lenses of an achromatic doublet should have, sum of the product of their powers and dispersive power equal to zero |