Just have to try out and make mistakes and relearn the correct way of doing things to master the thing one is learning. The best way is still to draw out your own ray diagram to figure out what type of image is formed and then guess the use of the lens using common sense. You may refer to your own school notes, textbooks or assessment books for these other examples. ![]() Take refractive index of water n be 1.33.Īns: Applying the formula sin C = 1/ n, we will substitute the value of n to be 1.33 and just solve the formula to find angle C, the critical angle. This is basically what the question in this video is talking about. Qn asked: Find the critical angle for light travelling in the water. I provide another simple way to appreciate the question asked in this video if you find the question asked on finding critical angle a bit confusing. The refractive index of water n in this video is 1.33 being substituted into the formula for finding critical angle. If you got a little bit confused over the beginning part about applying refractive index of the two media using Snell's Law, just ignore that part and look at the last few steps which resembles sin C = 1 / n. The calculation shown in this video is using this formula sin C = 1 / n for finding critical angle. C is critical angle and n is the refractive index of denser medium. ![]() When light is travelling at angle of incidence greater than critical angle, total internal reflection occurs. This video explores critical angle, total internal reflection and formula sin C = 1/ n.ĭo take note that total internal reflection can have a possibility of happening ONLY when light is travelling from a denser medium to a less dense medium (for O level the less dense medium is always given as air).Ĭritical angle is the angle of incidence of light travelling in the denser medium in order to have an angle of refraction of 90˚ in the less dense medium.
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