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☆☆☆☆☆The Moon is NOT "luminous"; it does not shine with its own light. The light we see coming from the Moon is reflected sunlight.
On a related note, astronauts on the Moon have always landed during the lunar "day", which lasts for 14 days. But because the dark areas of the near side of the Moon are at the "full Earth", it will probably never be entirely dark. As the Earth is so much larger than the Moon, the reflected earthshine will be 5 to 10 times brighter than moonlight. Astronauts will probably have no trouble working by earthlight.
For A+ the answer is The moon does not produce light.
By definition, "luminous" means "giving off light". The moon has no light of it's own. It shines by reflected sunlight.
distance from mirror
Phosphor.
The imaginary line that extends straight out from the center of a reflective surface is the optical axis.
it can be projected
illuminated
Thats the right answer for a plus.
megaminx
Convex mirrors project a hemispherical surface
sound waves require a medium to transfer energy
FOR A+ USERS THE ANSWER IS Sound waves travel in all directions
sound waves require a medium to transfer energy
-- They are longitudinal waves and material medium is required for their propagation.
The device is called a "variac' and it is a type of transformer. It has a variable voltage ouput.
electricity
most of the EM spectrum is visible light.
