If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Total internal reflection

You might need: Calculator

Problem

As shown, three light rays traveling inside glass are incident on the air-glass interface at an angle theta, equals, 55, degree.
The refractive index of glass for the three rays is given in the table below.
RaysRefractive index
start color #bc2612, 1, end color #bc2612start color #bc2612, n, start subscript, 1, end subscript, equals, 1, point, 15, end color #bc2612
start color #a75a05, 2, end color #a75a05start color #a75a05, n, start subscript, 2, end subscript, equals, 1, point, 20, end color #a75a05
start color #0d923f, 3, end color #0d923fstart color #0d923f, n, start subscript, 3, end subscript, equals, 1, point, 25, end color #0d923f
Which ray(s) will escape from glass to air?
Choose all answers that apply:
Choose all answers that apply:
Stuck?
Stuck?