Light is necessary for sight and interacts with the eyes and brain to allow us to see. Reflection occurs when light changes direction at the interface between two different media, following the law that the angle of incidence equals the angle of reflection. Refraction is when a light ray changes direction and speed as it passes from one medium to another due to a change in density.

6. Light is the main reason why we can see.
Without light, there would be no sight. It
is because our ability to see is due to the
interaction between the light, the brain
and the eyes.

7. Reflection is when wave front changes
its direction between two different
media causing it to return from its point
of origin.

8. incident ray reflected
ray
According to this law, the
angle of incidence is equal
to the angle of reflection.

9. SPECULAR
REFLECTION DIFFUSE REFLECTION

12. It is when the direction of the light
traveling a straight line changes due
to change of medium.

13.  Refraction occurs when a light
ray changes mediums.
 The speed of light changes when
it changes mediums. In almost
every case, the direction of the
light ray also changes.

14.  When a light ray enters a new substance
perpendicular to the surface of the
substance refraction does not occur.

15.  When a light ray enters a new
substance obliquely to the surface of the
substance refraction does occur.

16.  Snell’s law shows the relationship between the
angle of incidence and the angle of refraction