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(which(u=1.5)Two similar thin equi-convex lenses, of focal lengthfeach, are kept coaxially in contact with each othersuch that the focal length of the combination isF . When the space between the two lenses isfilled with glycerin (which has the same refractiveindex (u = 1.5) as that of glass) then the equivalentfocal length is F,. The ratio F:F, will be(1) 2:33:42:1(4) 1:2for |
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Answer» 3) is the correct answer |
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