The drawing shows a rectangular block of glass (n = 1.52) surrounded by air. A ray of

Question:

The drawing shows a rectangular block of glass (n = 1.52) surrounded by air. A ray of light starts out within the glass and travels toward point A, where some or all of it is reflected toward point B. At which points does some of the light escape the glass?
(a) Only at point A
(b) Only at point B
(c) At both points A and B
(d) At neither point A nor point B