Question

The product of the Geometric Length of the path light follows through the system, and the refractive index of the medium is known as __________

(a) Fermat Path

(b) Optical Path

(c) Ray Path

(d) Optical Path Difference

I got this question during an interview for a job.

My question is based upon Dispersion, Fermat’s Principle & its Application in portion Optics of Engineering Physics II

Answer 1

The correct choice is (b) Optical Path

For explanation: The product of refractive index of the medium & geometric distance travelled by the light in the medium is known as Optical Path. A difference in optical path length between two paths is called Optical Path Difference. An Imaginary path along which energy travels associated with a point on a wave front is known as Ray Path.