1) 1. Total internal reflection happens when light travels from: a) A. Air to glass b) B. Denser to rarer c) C. Vacuum to air d) D. Water to glass 2) 2. Total internal reflection occurs only when angle of incidence is: a) A. Less than critical angle b) B. Equal to critical angle c) C. Greater than or equal to critical angle d) D. Zero 3) 3. The critical angle is the angle of incidence for which the angle of refraction is: a) A. 90° b) B. 0° c) C. 45° d) D. 180° 4) 4.Which tool provides a narrow straight beam of light? a) A. Torch b) B. Candle c) C. Laser pointer d) D. Bulb 5) 5.A glass slab is an example of a: a) A. Rarer medium b) B. Denser medium c) C. Magnetic material d) D. Gas 6) 6. During TIR, the light ray: a) A. Bends into the air b) B. Passes straight c) C. Gets reflected inside the glass d) D. Stops completely 7) 7.Which surface is used to draw the path of the light ray clearly? a) A. Black cloth b) B. Rough wooden plank c) C. White paper d) D. Mirror 8) 8.When the angle of incidence increases, the refracted ray: a) A. Goes away from the normal b) B. Goes toward the normal c) C. Stays the same d) D. Disappears at small angles

JKC Activity: Refractive index of Glass by total internal reflection.

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