When a light rays enters a medium with refractive index n2 from a medium with refractive index n, at curved interface with radius of curvature

Question

When a light rays enters a medium with refractive index n₂ from a medium with refractive index n₁, at curved interface with radius of curvature R is given by \(\frac {n_2}{v}-\frac{n_1}{u} =\frac{n_2-n_1}{R}\)

Now assume that the surface is plane and rewrite the formula with suitable changes.

Answer 1

Assume that the interface is plane surface 

Then R becomes infinity 

R = ∞ (or) R = 1/0

Substitute the above value in the given equation