Verified Solution • 2025–26 Session
moderate
QJEEM19Ph3aac: JEE Main 2019 Physics - Class 12 JEEM19Ph3aac Solution: A ray of light AO in vacuum is incident on a glass slab at…
A ray of light AO in vacuum is incident on a glass slab at angle 60° and refracted at angle 30° along OB as shown in the figure. The optical path length of light ray from A to B is: 
Multiple Choice Options
- A 2a + 2b/
- B 2a + 2b/3
- C 2a + 2b
- D 2 /a + 2b
Step-by-Step Verified Solution
From Snell’s law
1 sin 60° = sin 30°
=
Optical path = AO + (OB)
=
= 2a + 2b
1 sin 60° = sin 30°
=
Optical path = AO + (OB)
=
= 2a + 2b