Exam 20: Light Color and Atmospheric Optics

Plants appear green to us because they ____.

Light that travels from a less-dense to a more-dense medium ____ speed and bends ____ the normal.

Sunlight reflecting off ice crystals produces which of the following?

A corona is due to diffraction of light.​

A star much hotter than our Sun radiates more energy at shorter wavelengths and thus appears redder.

Describe how,when,and where Sun pillars are formed.

An atmospheric phenomenon that causes objects to appear inverted is called ____.

At high latitudes during the summer,morning and evening twilight may converge,producing a(n)____,or a nightlong twilight.

Volcanic eruptions rich in ____________________ can produce red sunsets.​

When electromagnetic waves from the Sun reach the human eye,they stimulate antenna-like nerve endings in the ____.

Look for sun pillars when the Sun is ____ on the horizon and ____ clouds are present

____________________ is the name given to the time after sunset (and immediately before sunrise)when the sky remains illuminated.​

Compare a corona of the moon to dropping a small stone into a pond.

When we look at a cloud,it appears white because countless cloud droplets ____.

A star much hotter than our Sun radiates more energy at ____.

Which events are caused by the refraction of light through ice crystals?

Secondary rainbows occur when ____.

A whitish halo around the Sun,or a bright sheen visible in a nearby layer of thin clouds,is often the result of Mie scattering.

Explain the difference between crepuscular and anticrepuscular rays.​

Cloud iridescence is most often seen within 20° of the Sun,and it is often associated with clouds such as ____.