Question

What is achromatism? Derive a
condition to achieve achromatism for a
lens combination. State the conditions
for it to be converging.​

Answer 1

Answer:

Explanation:

✯ACHROMATISM:--

================

●achromatism is the phenomenon by virtue of which an object seen in white light through a lens would appear white i.e.there is no colour splitting

_____

●CONDITION:-

=============

To achieve achromatism ,all colours should be focused at a single point .To produce an achromat lens , a convex lens with positive chromatic aberration should be combined with a suitable concave lens of negative chromatic aberration so that total chromatic aberration is zero.

______★