1 . Distinguish between step index and graded index fibre.
Derive the expression for NA of the optical fibre.
problem
2 . Distinguish between spontaneous and stimulated emission.
Describe the construction and working of Ruby & He - Ne laser.
3 . Describe any 3 fabrication methods of nanoparticles.
Derive the expression for the Sbine's formula
4 . Derive the expression for internal fields in solids.
problem
apart from this problems from the optical fibre and dielctric propertis..
