PHYSICA HELP?
2018-05-16 12:04 pm
A coin lies on the bottom of a pool under 1.5 m of water (n=1.33) and .9 m from the side wall. If a light beam is incident on the water surface at the wall, at what angle theta relative to the vertical must the beam be directed so that it will illuminate the coin?
回答 (2)
2018-05-16 5:56 pm
✔ 最佳答案
Refer to the diagram below.sinθ / sinϕ = 1.33
sinθ / [0.9 / √(1.5² + 0.9²)] = 1.33
sinθ = 1.33 × 0.9 / √(1.5² + 0.9²)
θ = 43.2°
2018-05-16 12:05 pm
V
收錄日期: 2021-04-24 01:02:05
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20180516040455AAdl7iK