A light ray entering an optical fiber (made from crown glass) surrounded by air is first refracted and then reflected as shown below. 01 ոլ | ոշ 03 *02 Figure Description a. What is the minimum angle B₁ (greater than or equal to 0) at which an incident ray will still be totally internally reflected? Hint for (a) Minimum angle 8₁ = deg. (Only enter values 0 or greater.) b. What is the maximum angle e₁ (smaller than 90 deg) at which an incident ray will still be totally internally reflected? Hint for (b) Maximum angle e₁ = deg. c. If the optical fiber is made with material other than crown glass, what minimum value n₂ is needed for refractive index of the material to ensure that all incident rays are totally internally reflected? Hint for (c) Minimum n₂ needed =

A light ray entering an optical fiber (made from crown glass) surrounded by air is first refracted and then reflected as shown below. 01 ոլ | ոշ 03 *02 Figure Description a. What is the minimum angle B₁ (greater than or equal to 0) at which an incident ray will still be totally internally reflected? Hint for (a) Minimum angle 8₁ = deg. (Only enter values 0 or greater.) b. What is the maximum angle e₁ (smaller than 90 deg) at which an incident ray will still be totally internally reflected? Hint for (b) Maximum angle e₁ = deg. c. If the optical fiber is made with material other than crown glass, what minimum value n₂ is needed for refractive index of the material to ensure that all incident rays are totally internally reflected? Hint for (c) Minimum n₂ needed =