Reflection and refraction are phenomena that are well-explained by the

behaviors of light. When a source emits light, its dual property can be observed in

different circumstances.

Light, as waves, 1) __________ in all directions when emitted. Upon

impacting a smooth, specular surface, such as a mirror, these waves 2) __________

or reflect according to the arrival angles. The waves turn back to front as they

reflect producing a 3) __________ image.

On the otherhand, light can also arrive at the mirror surface as a stream of

4) ____________. Since these are very tiny, a huge number are involved in a

propagating light beam. Upon arriving a 5) __________ surface, the particles bounce

off in different points so their order in the beam is reversed resulting to a reversed

image.

A beam of light undergoes 6) __________ when it travels between two media

with different refractive indices.

Light, as waves, 7) __________ direction upon passing from first medium to

second medium. A small portion of each angled 8) ___________ should impact the

second medium before the rest of the front reaches the 9) ___________. This part will

travel along the second medium while the rest of the waves is still travelling in the

first medium. Movement will be 10) __________ through the second medium due to

higher refractive index. Since the wavefronts are travelling at different speeds, light

will 11) ___________ into the second medium, thus, changing the angle of

propagation.
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