Find the angle at which total internal refraction takes place when light is going from glass to air.
The angle at which this takes place is called the critical angle.
We can apply Snell's law in this situation: n1 sin C1 = n2 sin (90deg)
sin C = n2 / n1
If the second medium is air, then n2 ~1, so sin C = 1/ n1
CT
Related Physics A Level answers
All answers ▸Why do atoms larger than iron release energy when they undergo fission?
Why does magnetic field do no work on an electric charge?
An electron falling from one energy level to another emits a photon of wavelength 550nm. What is the difference between the two energy levels?
A block of mass m is released from rest on a surface inclined at 30⁰ to the horizontal with a coefficient of friction of 0.3. How long does it take for the block to slide 1 m?