Question

optical path is
equal to
​

Answer 1

Optical path = path-length x refractive index .

Explanation:

• The result of the geometric length of the path and the refractive index of the medium through which light spreads is known as an optical path.
• The difference between the lengths of the two optical paths is known as optical path difference.
• The optical path difference calculation can be done by using the equation.
• OPD=  d₁n₁- d₂n₂.
• Now, n₂ is smaller refractive index as compared to the n₁ and the distances of the rays passing from medium are d₁ and d₂, hence

Optical path = path-length x refractive index