Please answer parts B, C, and E. Thank you! (Figure 1) shows an optical fiber made of crown glass (nglass = 1.52) surrounded by air (nair = 1.00) An incident ray enters the fiber on the left side with an angle of incidence @1 Learning Goal: Refraction and Total Internal Reflection (suggestion: self assessment - no hint, time limit, max of 2 attempts) Part A - What is the critical angle of incidence @, for crown glass surrounded by air? The setting of this problem as assignment is regular. (Figure 1)shows an optical fiber made of crown glass (nglass = 1.52) surrounded by air (nair = 1.00) Enter a regular number with 2 digits after the decimal point. He = 41.14 0 Submit Previous Answers Correct Case 1: angle of incidence 61 is small Figure