A hollow double concave lens is made of very thin transparent material. It can be filled with air or either of two liquids L 1 and L 2 having refractive indices 
and 
respectively ( 
). The lens will diverge a parallel beam of light, if it is filled with :
Text Solution
Verified by ExpertsThe correct answer is:
D
From lens makers formula
For a concave lens, 
is negative and 
is positive
is negative 
will be negative only when 
lens must be filled with 
and placed in 
as shown is the above figure.
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