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3.2.2 Refraction of light

Which of the following statements about refraction and reflection of light is correct?

The speed of light in a plastic of refractive index $n$ is equal to the speed of light in a vacuum multiplied by $n$ .

The angle of incidence of a light ray at an air-plastic boundary is the angle between the ray and the plastic boundary.

The sine of the critical angle $c$ at a plastic-air boundary is equal to $1n\frac{1}{n}$ , where $n$ is the refractive index of the plastic.

For light passing from air into plastic, the angle of refraction is directly proportional to the angle of incidence.

3.2.2 Refraction of light Questions

100 exam-style questions on CIE IGCSE Physics 3.2.2 Refraction of light. Each one has a worked solution and a mark scheme showing where the marks go.

Which of the following statements about refraction and reflection of light is correct?

The speed of light in a plastic of refractive index $n$ is equal to the speed of light in a vacuum multiplied by $n$ .

The angle of incidence of a light ray at an air-plastic boundary is the angle between the ray and the plastic boundary.

The sine of the critical angle $c$ at a plastic-air boundary is equal to $1n\frac{1}{n}$ , where $n$ is the refractive index of the plastic.

For light passing from air into plastic, the angle of refraction is directly proportional to the angle of incidence.

100 exam-style questions on CIE IGCSE Physics 3.2.2 Refraction of light. Each one has a worked solution and a mark scheme showing where the marks go.