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absorbtion and reflective coefficients are given then nature of body

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If absorption and Reflection coefficient of a body are 0.4 and 0.6 respectively , then what is the nature of body : translucent/ transparent / opaque/ real body .

I could not find relation between these coefficients in my text as well as internet , how shall I decide the tranparency or if the body is opaque ?

What I thought was that if absorbtion coefficient is less then it should not be opaque and be translucent , but given answer is translucent?

I also didn't understand what it means by real body .

asked Apr 8, 2017 in Physics Problems by physicsapproval (2,320 points)

1 Answer

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I don't understand what a "real body" is either. Isn't there a definition in your textbook or syllabus? Possibly they mean "black body".

With this information there is no way of telling the difference between transparent and translucent : both have T > 0. For a black body A=1 and T=R=0 : all light is absorbed (and subsequently re-emitted). By elimination the answer must be opaque, which is consistent with T=0.

answered Apr 8, 2017 by sammy gerbil (28,876 points)
selected Apr 9, 2017 by physicsapproval
what is T ?  and how do we tell difference in translucent and transparent body as you mentioned in the answer ? i.e. what else is required ?
T is transmission coefficient. Possibly transparent means A=0 while translucent means A > 0. But really I think the difference has more to do with refraction and scattering of light, which are not related to A, T, R.