alleryRefractive index of water is 1.33. Critical angle for water-air interface:
A30°
Bsin⁻¹(1/1.33) ≈ 48.75°
C90°
D60°
Answer & Solution
Correct answer: B. sin⁻¹(1/1.33) ≈ 48.75°
sin θ_c = 1/n = 1/1.33 ≈ 0.752. θ_c ≈ 48.75°.
Beyond this, light striking water-air interface from inside undergoes TIR.
Keep practising Ray Optics
Browse all Ray Optics questions for JEE Advanced, or explore more Physics topics.
Related questions
Complete the lens formulaFind the property that does not match concave mirrorsRefraction — true or false?A ray enters a glass slab at 45°. Glass n = 1.5. Angle of refraction inside glass:For total internal reflection at glass-water interface (n_g = 1.5, n_w = 1.33), critical aFor object at 60 cm from convex lens of f = 20 cm, image is:Magnifying power of simple magnifier (image at near point):Refractive index of medium 1 w.r.t. medium 2 is n₁₂. Then: