Two thin biconvex lenses have focal lengths 
and 
. A third thin biconcave lens has focal length of 
. If the two biconvex lenses are in contact, the total power of the lenses is 
. If the first convex lens is in contact with the third lens, the total power is 
. If the second lens is in contact with the third lens, the total power is 
then
A
and 
B
and 
C
and 
D
and 
Text Solution
Verified by ExpertsThe correct answer is:
D
: Convex lenses have positive focal length whereas concave lenses have negative focal length.
For the two convex lenses,
For first and third lens,
For second and third lens,
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