Reflection Of Light By Spherical Mirrors

The velocity of light in a material medium can be determined from its relative permittivity (∈_r) and relative permeability (µ_r). In a vacuum, the speed of light 'c' is defined as follows:

In any other medium, the velocity 'v' is influenced by the medium's relative permittivity and permeability. The velocity of light 'v' in a medium is given by:

where ∈ = ∈_r∈₀ and µ = µ_rµ₀. Substituting these into the equation, we get:

This simplifies to:

Recall that the velocity of light in a vacuum (c) is:

Thus, we can rewrite the velocity 'v' in terms of 'c':

Hence, the correct expression for the velocity of light in a material medium is: