Two similar thin equi-convex lenses, of focal f each, are kept coaxially in contact with each other such that the focal length of the combination is F 1 . When the space between the two lens is filled with glycerin (which has the same refractive index ( μ = 1.5) as that of glass) then the equivalent focal length is F 2 . The ratio F 1 : F 2 will be
Text Solution
Verified by ExpertsThe correct answer is:
C
f eq = f 1 | 
= (1.5 – 1)2/R
| = 
f 1 = 
| 
f 2 = R with glycerin : focal length of concave lens is formed
= (m–1) 
= 
= 
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