1) Total internal reflection occurs when light travels from a ______ medium to a ______ medium. a) Denser to rarer b) Rarer to denser c) Vacuum to glass d) Glass to air 2) At the critical angle, the refracted ray makes an angle of ______ with the normal. a) 30° b) 45° c) 60° d) 90° 3) For total internal reflection to occur, the angle of incidence must be ______ the critical angle. a) Less than b) Equal to c) Greater than d) Zero 4) Diagram shows a ray moving from glass to air. If the incident angle = 50° and critical angle = 42°, the ray will.. a) Refract into air b) Pass straight c) Get absorbed d) Reflect back into glass 5) Which of the following is a necessary condition for total internal reflection? a) Light must travel from a rarer to a denser medium b) The angle of incidence must be greater than the critical angle c) Light must be monochromatic d) The medium must be transparent 6) In a water–air boundary, if critical angle is 48°, and angle of incidence is 30°, what happens? a) Total internal reflection b) Absorption c) No bending d) Normal refraction 7) Which natural phenomenon occurs due to total internal reflection? a) Rainbow b) Mirage c) Eclipse d) Dispersion 8) In an optical fibre, light is guided along its length mainly by: a) Refraction at the core b) Dispersion at the surface c) Total internal reflection d) Absorption in cladding 9) The reason diamonds sparkle is mainly due to.. a) High density b) Multiple refractions c) High refractive index causing total internal reflection d) Dispersion of white light 10) Total internal reflection does NOT occur when light passes from: a) Glass to air b) Water to air c) Diamond to air d) Air to water

Explain how total internal reflection occurs

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