Refraction and total internal reflection

Question 1 of 10

A ray of light passes from air into a glass block of refractive index 1.5 at an angle of incidence of 50°. (a) State Snell's law. (b) Calculate the angle of refraction. (c) Calculate the critical angle of the glass. (d) Explain, with a diagram, what happens to a ray inside the glass that strikes the glass–air surface at an angle greater than the critical angle.

Question 2 of 10

A coin lies at the bottom of a tank of liquid 6 m deep. If the refractive index of the liquid is 1.5, find the apparent depth, to 2 decimal places.

Question 3 of 10

Real depth ÷ apparent depth equals

Question 4 of 10

A ray of light in air strikes glass at an angle of incidence of 60° and is refracted at 22°. Find the refractive index of the glass, to 2 decimal places.

Question 5 of 10

A ray of light passes from air into a glass block of refractive index 1.52 at an angle of incidence of 50°. (a) State Snell's law. (b) Calculate the angle of refraction. (c) Calculate the critical angle of the glass. (d) Explain, with a diagram, what happens to a ray inside the glass that strikes the glass–air surface at an angle greater than the critical angle.

Question 6 of 10

A ray of light in air strikes glass at an angle of incidence of 45° and is refracted at 22°. Find the refractive index of the glass, to 2 decimal places.

Question 7 of 10

Light (speed 3 × 10⁸ m/s in vacuum) enters a medium of refractive index 1.5. Its speed in the medium is ___ × 10⁸ m/s.

Question 8 of 10

A ray of light in air strikes glass at an angle of incidence of 30° and is refracted at 28°. Find the refractive index of the glass, to 2 decimal places.

Question 9 of 10

A ray travelling along the normal is not bent.

Question 10 of 10

Find the critical angle for a medium of refractive index 1.33, to 1 decimal place.