Reflection

Light waves can bounce off surfaces.

• True.

• False.

• I don't know.

​ (a)   , ​ (b)   surfaces e.g. a mirror have a clear reflection and forms a clear image.

• Smooth
• shiny
• rough
• dull

Rough, dull surfaces e.g. paper have a diffuse reflection - light is scattered in different directions and forms a blurry image or no image at all.

• True.

• False.

• I don't know.

a

b

c

d

Smooth, shiny surfaces

Rough, dull surfaces

Clear reflection

Diffuse reflection

a

b

c

transmission

absorbtion

reflection

d

e

f

g

c

b

a

Plane mirror

Angle of incidence

r

Angle of reflection

i

Reflected ray

Incident ray

The image in a plane mirror is always laterally inverted (letters and words look as if they have been written backwards).

• True.

• False.

• I don't know.

In a periscope, the two plane mirrors are positioned at ​ (a)   to each other.

• 45°
• 90°
• 180°
• 75°

Light is reflected at ​ (a)   angles from the ​ (b)   mirror onto the bottom ​ (c)   and into the eye of the viewer.

• right
• top
• mirror
• obtuse