Answer:
C) 30°
Explanation:
According to laws of refraction:
1. The incident ray, the normal and refracted ray- all lie in same plane.
2. The angle of incidence (i) and angle of refraction (r) are related as:
η₁ sin i = η₂ sin r (Snell's Law)
where η₁ is the refractive index of the medium in which incident ray lies and η₂ is the refractive index of the medium in which refracted ray lies.
Given:
η₁ = 1.33 (water)
η₂ = 1.00 (air)
i = 22°
r = ?
⇒1.33 sin 22° = 1.00 sin r
⇒ r = sin⁻¹ (0.50) = 30°
Thus, the angle of refraction is air is 30°
