If velocity of light in air is C m/sec then what will be the velocity of light in medium of refractive index 1.4?

Question

If velocity of light in air is C m/sec then what will be the velocity of light in medium of refractive index 1.4? (A) 2.1 × 108 m / s (B) 1.4 × 108 m / s (C) 2.8 × 108 m / s (D) None of these

Tardigrade Admin · Accepted Answer

Absolute refractive index =(Speed of light in vaccum/Speed in medium) μ=(c/v) So, speed in medium, v=(3×108/1.4)=2.14×108 m / s

Q. If velocity of light in air is $C m / sec$ then what will be the velocity of light in medium of refractive index $1.4$ ?

$2.1 \times 1 0^{8} m / s$

$1.4 \times 1 0^{8} m / s$

$2.8 \times 1 0^{8} m / s$

None of these

Absolute refractive index
$= \frac{Sp ee d o f l i g h t in v a cc u m}{Sp ee d inm e d i u m}$
$μ = \frac{c}{v}$
So, speed in medium,
$v = \frac{3 \times 1 0 ^{8}}{1.4} = 2.14 \times 1 0^{8} m / s$

Q. If velocity of light in air is Cm/sec then what will be the velocity of light in medium of refractive index 1.4?

2.1×108m/s

1.4×108m/s

2.8×108m/s