Time taken by sunlight to pass through a window of thickness 4 mm whose refractive index is (3/2) is:

Question

Time taken by sunlight to pass through a window of thickness 4 mm whose refractive index is (3/2) is: (A)  2× 10-4s  (B)  2× 104s  (C)  2× 10-11s  (D)  2× 1011s

Tardigrade Admin · Accepted Answer

Time taken =(μ t/c) =((3/2)× 4× 10-3/3× 108) =2× 10-11s

Q. Time taken by sunlight to pass through a window of thickness $4 mm$ whose refractive index is $\frac{3}{2}$ is:

$2 \times 10^{- 4} s$

$2 \times 10^{4} s$

$2 \times 10^{- 11} s$

$2 \times 10^{11} s$

$2 \times 10^{8} s$

Time taken $= \frac{μ t}{c}$
$= \frac{\frac{3}{2} \times 4 \times 10 ^{- 3}}{3 \times 10 ^{8}}$
$= 2 \times 10^{- 11} s$

Q. Time taken by sunlight to pass through a window of thickness 4mm whose refractive index is 23​ is:

2×10−4s

2×104s

2×10−11s

2×1011s

2×108s

Time taken =cμt​ =3×10823​×4×10−3​ =2×10−11s