If 
and 
are the focal lengths of a convex lens for violet and red light respectively and 
and 
are the focal lengths of a concave lens for violet and red light respectively, then we must have
A
and 
B
and 
C
and 
D
and 
.
Text Solution
Verified by ExpertsThe correct answer is:
B
: For a convex lens, 
or 
. For a concave lens, focal length is negative.
or 
as the smaller negative value is bigger.
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