Question

The speed of light in a medium of absolute refractive index 1.5 is 2* 10^8 m/s

Answer 1

good morning mate.

given.

n=1.5

v= 2×10^8m/s

now.

n=c/v

c=nv

c=1.5 × 2 ×10^8

c=3×10^8m/s

the speed of light in vacumn or air is 3×10^8m/s.

the speed of light in air is only marginally less thus speed of light in air is also taken as speed of light in vacumn

Answer 2

Answer:

$n = c \div v$

1.5=c/2*10^-8

$1.5 = c \div 2 \times {10}^{ - 8} \\ c = 1.5 \times 2 \times {10}^{ - 8 } \\ c = 3 \times {10}^{ - 8}$

this may help u