Question

Time taken by sunlight to pass through a window
of thickness 4 mm whose refractive index is 3 is
2
(a) 2 × 10⁻⁴ sec (b) 2 × 10⁸ sec
(c) 2 × 10⁻¹¹ sec (d) 2 × 10¹¹ sec

Answer 1

Explanation:

option b is the answer...