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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.

## BrainMass Categories within Propagation of Light

### Light Refraction

Solutions: 165

Refraction is the change in direction of a wave due to a change in its transmission medium.

### Light Reflection

Solutions: 94

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.

### Light Interference

Solutions: 58

Interference is a phenomenon in which two waves superimpose to form a resultant wave of greater or lower amplitude.

### Light Diffraction

Solutions: 29

Diffraction is a phenomenon which occurs when a wave encounters an obstacle.

### 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?

### Rayleigh resolution

Describe in detail the Rayleigh criterion of resolution

### 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 &#61549;. 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