Define the term, ‘Critical Angle’. What is meant by ‘total internal reflection’? State two essential conditions for total internal reflection to take place. With the help of a ray diagram, illustrate an application of total internal reflection.OR(a) What is meant by a ‘magnetic field’?(b) How is the direction of magnetic field at a point determined?(c) Describe an activity to demonstrate the direction of the magnetic field generated around a current carrying conductor.(d) What is the direction of magnetic field at the centre of a current carrying circular loop?
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Angle of incidence beyond which Ray's of light passing through a denser medium to surface of less dense medium are refracted but totally reflected is caled critical angle.
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