An ultrashort laser pulse enters an unknown liquid from air at normal incidence

PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

An ultrashort laser pulse enters an unknown liquid from air at normal incidence, travels

2.00\,\text{m}

through the liquid, and exits into a block of crown glass (

n = 1.52

). The transit time through the liquid is

9.0\,\text{ns}

. Immediately before entering the glass the light ray makes an angle of

25^{\circ}

with the normal to the interface. Which of the following is the angle of the refracted ray inside the glass? (a)

29^{\circ}

(b)

22^{\circ}

(c)

19^{\circ}

(d)

12^{\circ}