Question

5. A ray of light strikes a thick sheet of glass (n = 1.5 ) at an angle of 25° with the normal. Find the angle of the ray reflected off the glass surface with respect to the normal. a. 56 b. 46° c. 39° d. 25° A beam of light in air is incident at an angle of 30° to the surface of a rectangular block of clear plastic (n = 1.46). The light beam first passes through the block and re-emerges from the opposite side into the air at what angle to that surface? a. 42° b. 23° c. 30° d. 59° 7. According to the photon energy formula, tripling the frequency of the radiation from a monochromatic source will change the energy content of the individually radiated photons by what factor? a. 0.33 b. 1.0 C. 1.73 d. 3.0 A fiber optic cable (n = 1.50 ) is submerged in water (n = 1.33 ). What is the critical angle for light to stay inside the cable? a. 83.10 b. 62.50 C, 41.8° d. 27.6° Page 2 of 6

Answer 1

Angle of Normal = strikes Angle with the on Reflection 0; 2 250 So 8.-25°