Question

A ray of light is passing through a medium of refractive index 1.5. Calculate the speed of light in this medium if the speed of light in vacuum is 3 x 100000000 m/s​

Answer 1

How will I know that you are going to do

Answer 2

Answer:

we know that refractive index n=

$\frac{speed \: of \: light \: vacuum}{speed \: of \: light \: in \: mediu}$

$where \: c \: = 3 \times {10}^{8} ms$

$1.5 = \frac{c}{v}$

$v = \frac{3 \times {10}^{8} }{1.5}$

$v = 2 \times {10}^{8} ms$

For critical angle we will use snell's law

C is critical angle

$n_{glass}( \sin(c) = n_{air}( \sin(90) n_{air} = 1$

$\sin(c) = \frac{1}{nglass} = \frac{1}{1.5}$

C = 41.8°