Two similar thin equi-convex lenses, of focal length $f$ 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 lenses is filled with glycerin (which has the same refractive index ( $\mu=-1.5$ ) as that of glass) then the equivalent focal length is $ F_2.$ The ratio $F1: F2$ will be:

Question

Two similar thin equi-convex lenses, of focal length $f$  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 lenses is filled with glycerin (which has the same refractive index ( $\mu=-1.5$ ) as that of glass) then the equivalent focal length is $ F_2.$  The ratio  $F1: F2$  will be:

cdquestions Admin · Accepted Answer

The correct option is (B) : $1:2$

Answer

Answer

Answer

Answer

The Correct Option is B

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