If ray travelling in air is incident on a transparent medium as shown in the diagram, the refractive index of the medium is given as
Attached Figure / Diagram
A
cosα / sinβ
B
sinα / sinβ
C
cosβ / sinα
D
sinβ / sinα
Verified Correct Answer: A.
Physical Principles & Numerical Solution
\(n = \frac{sin i}{sin r}\)
\(i = 90 - \alpha\)
\(\therefore n = \frac{sin 90 - \alpha}{sin \beta}\)
⇒ \(n = \frac{cos \alpha}{sin \beta}\)
Source: Myschool Past Questions Archive (Record #11828)