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 40°. (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 ray of light passes from air into a glass block of refractive index 1.6 at an angle of incidence of 40°. (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 3 of 10

Light (speed 3 × 10⁸ m/s in vacuum) enters a medium of refractive index 1.25. Its speed in the medium is ___ × 10⁸ m/s.

Question 4 of 10

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

Question 5 of 10

The refractive index of a medium is also equal to

Question 6 of 10

A ray of light in air strikes glass at an angle of incidence of 40° and is refracted at 19°. 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 2. Its speed in the medium is ___ × 10⁸ m/s.

Question 8 of 10

Find the critical angle for a medium of refractive index 2.42, to 1 decimal place.

Question 9 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 10 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.