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Propagation of Light

Light travels in a straight line through air or a vacuum at approximately 2.9979x108m/s and takes eight minutes to come from the Sun to Earth. Propagation of light follows the inverse square law, the cosine law and the cosine cubed rule. When light meets a non-opaque objects it can be diffracted if wave density is not conserved. This is known as the rainbow phenomenon.

Light displays both wave and particle like properties. Light acts as a particle with respect to its emission and its absorption behaviours. Light acts as a wave by its propagation and interference properties.

Light can be refracted, reflected, interfered or diffracted when passed through different mediums that are not opaque or transparent. 

Categories within Propagation of Light

Light Reflection

Postings: 95

Reflection is the change of direction of a wave front at an interface between two different media so that the wave front returns into the medium from which it originated.

Observing a Spaceship from Earth

A spaceship moving past the earth with a speed of 0.8 c blasts the earth with pulsed laser photons every 10 seconds. For the observers on earth who see the flashes, what is the time interval they measure?

Amplitude, wave, acceleration and gravity problems

Please see attached file for full problem description. A large ant is standing on the middle of a circus tightrope that is stretched with tension Ts. The rope has mass per unit length . Wanting to shake the ant off the rope, a tightrope walker moves her foot up and down near the end of the tightrope, generating a sin