Question

23.If The refractive index of glass is 1.5 and the velocity of light in
air is 3x 108 m/s, what is the light velocity in the glass​

Answer 1

Answer:

as we know n= c/v

so v=n×c

v in glass= 4.5×10^8

Answer 2

Explanation:

we know that retroactive index =speed of light is vacuum upon

speed of light in medium

where c =3× 10⁸m/s

1.5 =c upon v

v=3×10⁸

upon 1.5

v= 2×10⁸m/s

for critical angle we will use Snell's law

c is critical angle

n glass sin c =n air sin 90 n= air 1

sin c =1

upon

n glass =1.5

c= 41.8⁰