Two identical glass 
equiconvex lenses of focal length 
each are kept in contact. The space between the two lenses is filled with water 
. The focal length of the combination is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
: Here, 
Focal length ( 
) of glass convex lens is given by
or 
or 
(i)
Focal length 
of water filled concave lens is given by
or 
[Using eqn. (i)] Equivalent focal length 
oflens system
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