A Capillary tube is made of glass of refractive index n1 . The outer radius of the tube is R.The tube is filled with a liquid of refractive index n2 < n1 .what should be the minimum internal radius of the tube so that any ray that hits the tube would enter the liquid
The Attempt at a Solution
I know that in an optical fibre they are core and cladding.it operates by principle of total internal reflection.i have calculated maximum incident angle possible
As i = arcsin √n12
How to get terms in terms of R and should we consider any size approximations as it is a capillary tube is what I can't understand.
If we should consider approximations then how?Please help me