" Desire relation "v=u+" at using calculas method.(Symbols have their usual meaning) "

Bohr magnetonis given by (symbols have their usual meanings)

Show that j = sigmaE where symbols have their usual meanings.

Derive graphically the relation v=u+at ,where the symbols have their usual meaning.

Deduce the relation between n,u,v, Q, R for refraction at a spherical surface, where the symbols have their usual meaning.