This video lecture from Optical Instruments (F.Sc. first year physics) covers Total Internal reflection, Snell’s law, and the concept of critical angle. You will learn that in our daily life where this phenomenon is occurred, due to clear difference between reflection and refraction you will learn the concept of total internal reflection. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.