Physics P14 - Light

What is the definition of 'Reflect'?

• The wave bounces off a surface; the angle of incidence is equal to the angle of reflection.

• The wave is absorbed by the surface and does not bounce back.

• The wave passes through the surface without any change in direction.

• The wave is scattered in all directions upon hitting the surface.

What happens when a wave 'Refracts'?

• The wave changes direction when it enters a medium of different density where it has a different speed.

• The wave disappears completely.

• The wave increases in frequency.

• The wave travels in a straight line without changing speed.

Define 'Normal' in the context of reflection.

• The normal at a point on a mirror is a line drawn perpendicular to the mirror at the point of incidence.

• The normal is a line parallel to the mirror surface.

• The normal is a line that bisects the angle of incidence and reflection.

• The normal is a line that runs along the surface of the mirror.

State the Law of Reflection.

• The law of reflection states that the angle of incidence = the angle of reflection.

• The law of reflection states that light bends when it passes from one medium to another.

• The law of reflection states that the angle of incidence is greater than the angle of reflection.

• The law of reflection states that light travels in a straight line.

What is a 'Plane mirror'?

• A mirror with a flat (planar) reflective surface.

• A mirror with a curved reflective surface.

• A mirror that magnifies objects.

• A mirror that distorts images.

What is a 'Real image'?

• An image that can be seen on a screen because it is formed by focussing light rays onto the screen.

• An image that cannot be projected onto a screen.

• An image that is always virtual and cannot be captured.

• An image that is formed by diverging light rays.

What is a 'Virtual image'?

• An image formed at a place where the light rays appear to come from after they've been reflected (or refracted).

• An image that can be projected on a screen.

• An image formed by actual convergence of light rays.

• An image that is always inverted.

What is 'Specular reflection'?

• Reflection from a smooth surface, parallel rays are reflected in a single direction.

• Reflection from a rough surface, rays are scattered in different directions.

• Reflection that involves absorption and re-emission of light.

• Reflection that occurs only in vacuum.

What is 'Diffuse reflection'?

• Reflection from a rough surface, parallel rays are scattered in different directions.

• Reflection from a smooth surface, parallel rays remain parallel.

• Reflection that involves bending of light around corners.

• Reflection that occurs only in vacuum.

What does a 'Transparent' object do?

• A transparent object lets all light that enters it pass through (and doesn’t scatter or refract the light).

• A transparent object absorbs all light that enters it.

• A transparent object reflects all light that enters it.

• A transparent object scatters all light that enters it.