8.2 properties of light and 8.3 reflection of light (offline note)

8.2 PROPERTIES OF LIGHT

• The speed of light is 3.0x108 ms-1. Light travel
much faster than sound.
• Light travels in straight lines
• Shadows are formed when light is blocked by an
opaque object.

8.3 REFLECTION OF LIGHT

• light bounces off the surface of an object

No need to draw

Law of Reflection:-

i) The incident ray, reflected ray and the normal are all lie on the
same plane

normal

incident reflected
ray ray

plane mirror

Law of Reflection:-

ii) The angle of incident, i is equal to the angle of reflection, r

normal

angle of angle of reflected
incidence reflection ray
incident
ray

plane mirror

APPLICATION OF REFLECTION OF LIGHT

1. Workers at a construction site wear life
jackets that have light reflecting stripes so that
they can easily be seen by other workers

No need to draw

APPLICATION OF REFLECTION OF LIGHT

2. Using emergency triangular reflector for vehicle
breakdown so that the vehicle breakdown so that
the vehicle can be seen on the road.

No need to draw

APPLICATION OF REFLECTION OF LIGHT

3. Using reflective stripes for signboards so that
they can be seen easily at night.

No need to draw