Swimming pools are often fitted with bright lights under water for night use.
PHYSICS · Multi-part · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction
Problem
Swimming pools are often fitted with bright lights under water for night use.
(i) Explain with suitable ray diagrams why the floor of an illuminated pool appears closer to the surface than it actually is when viewed normally from the deck.
(ii) Discuss how the perceived depth changes, qualitatively, when the observer moves from normal viewing to an oblique viewing angle.
(iii) State two practical safety precautions that pool designers should take in view of this optical illusion.