But here, none of the light can be refracted because it can't get out of the medium. In fact, what happens when light is incident on a interface here is that usually it's a combination of both reflection and refraction. If the angle of refraction is 90 degrees, then the light isn't really refracting. Well, that means the light's not being refracted then. So it's like this, and that angle is so big that the angle of refraction is 90 degrees. The incident light is at an even bigger angle to the interface. Let us say that we go into an even bigger angle to the interface. Now, because it's bending away from the normal, what can happen if you go in at a big enough angle is the following. So this is the incoming light ray hits the interface, and this is the refracting light ray here. So the angle out here in the air is bigger than the angle in here in the glass. And the angles we use are those defined by, as I said, the normal line, which is this line here, the line that is normal to the interface between the two substances. So when a light ray is incident on this interface, the direction of travel of the light ray will bend away from the normal line. In this case, we're going from glass to air, and glass will have a higher index refraction than air does. Let's say we have an interface between two materials. To understand the question, let's talk about what that means. So this question involves total internal reflection.
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