Question

please please please please answer the question​

Answer 1

Snell's law (also known as Snell–Descartes law and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air.

Actually, ng = 3/2 and nw = 4/3.

Absolute Refractive Index of a medium = Speed of light in vacuum/Speed of light in the medium

Speed of light in glass = 2 x 108 m/s

Speed of Light in Vacuum = (3/2) x 2 x 108 m/s = 3 x 108 m/s

Speed of light in water = (3 x 108 m/s)/(4/3)

                                       = 2.25 x 108 m/s

Answer 2

wait for 2min im writing

its done its easy

just compare the refractive index with glass to glass then class to water then compare it with refractive index of glass with water which will give you 9/8 then compare it with c/v its given speed of light is 2*10^8m/s then 1.99*10^8m/s will be the ans