Question
When a light ray passes through from air to water with a non-zero angle the ray will be
NDA
General Ability
General Science
2025
NDA 2025 (Phase 1)
NDA General Ability Question (2025) — Solution
Options
- A. bending towards the normal
- B. bending away from the normal
- C. propagating in straight line
- D. reflected towards the opposite direction
Answer
A. bending towards the normal
Step-by-step solution
When a light ray travels from an optically rarer medium (air) to an optically denser medium (water), its speed decreases. According to Snell's law, _1 i = _2 r. Since the refractive index of water is greater than that of air ( _2 > _1), we have r Thus, the refracted ray bends towards the normal. Answer: bending towards the normal
Related: General Ability — General Science · All PYQ Banks