C.2 Reflection of Light B

What is light?

a form of energy

What is the speed of light?

3 × 10^8 m/s²

What direction does light usually travel?

in straight lines

What is a light ray?

a straight line showing the direction in which light is travelling

Name these three types of light rays.

diverging, converging, parallel

What is light necessary for?

vision

What is a luminous object?

an object that gives out its own light

What is a non-luminous object?

objects that do not give out their own light

What is the reflection of light?

the bouncing of light from an object

What are the two factors which dictate the way in which light bounces off an object?

the material of the object and the surface of the object

When does diffuse reflection occur?

when the reflected light from an object is scattered in all directions from the surface of the object

When does regular reflection occur?

when light hits a plane mirror, and the reflected ray makes the same angle with the mirror as the original ray that hit it

What is a plane mirror?

a flat, highly polished metal surface

What is A in this image?

incident ray

What is the incident ray?

the ray that strikes the mirror

What is B in this image?

point of incidence

What is the point of incidence?

the point on the plane mirror that the ray strikes

What is i in this image?

angle of incidence

What is the angle of incidence?

the angle between the incident ray and the normal

What is C in this image?

normal at the point of incidence

What is normal at the point of incidence?

the line drawn at a right angle to the mirror where the incident ray strikes the mirror

What is r in this image?

angle of reflection

What is the angle of reflection?

the angle between the reflected ray and the normal

What is D in this image?

reflected ray

What is the reflected ray?

the ray of light that bounces from the mirror

What is the first law of reflection of light?

the incident ray, the normal at the point of incidence and the reflected ray all lie in the same plane

What is the second law of reflection of light?

What occurs when light is reflected obeying the law of reflection of light?

regular reflection

What is a point object?

one with negligible dimensions

What is Q in this photo?

virtual image of P

What is a virtual image?

an image formed by the apparent intersection of rays

What is the first descriptor of a virtual image of a point object in a plane mirror?

it’s on the perpendicular from the object to the mirror

What is the second descriptor of a virtual image of a point object in a plane mirror?

it’s the same distance behind the mirror as the object is in front of the mirror

What is an extended object?

one with dimensions

What is lateral inversion?

the sideways reversal of an image in a plane mirror, where the right side of an object appears on the left, and the left side appears on the right

What is the technological/medical use of this arrangement of mirrors?

solar furnace

What is the technological/medical use of this arrangement of mirrors?

focused beam of light rays or a magnified image

What is the technological/medical use of this arrangement of mirrors?

car wing mirrors