From the given situation absolute refractive index of denser medium, ‌aµd=2 Absolute refractive index of rarer medium, ar=1 ∴ Refractive index of denser medium with respect to rarer medium ‌rµd=‌
‌aµd
aaµr
=‌
2
1
=2⇒‌rµd=2 If ic be the critical angle, then sin‌ic‌=‌