Astronomy

Collecting Power

Bigger telescope more light collected

Focusing Power

Use mirrors or lens to bend the path of light

Resolving Power

picking out the details in an image

Light gathering Power

Light collected proportional collector area

What are the four powers of a telescope

Light gathering, resolving, focusing and collecting power

what does a refraction use

a medium, or a substance that a wave passes through

what are lenses that collect and focus light

refracters

what are the disadvantages of large telescopes

larges lenses are extremely expensive to fabricate, large lenses will sag in the center since it can only be supported

What are the advantages of refractors

Less expensive to fabricate, it solves the large lens sag problem, and no dispersion, they absorb less light

Incoming light strikes a semiconductor surface, freeing electrons

Number of electrons is proportional to intensity of the light.

What chemically stores data to increase sensitivity to dim light.

Photographic Film

What is a inferometer

simultaneously combining observations from two or more widely-spaced telescopes.

A telescope’s ability to discern detail is referred to as its

resolving power

What is diffraction

Resolving power is limited by the wave nature of light through a phenomenon

What is a secondary mirror used for

may be used to deflect the light to the side or through a hole in the primary mirror.

What telescope is located 14,000 foot volcanic peak Mauna Kea in Hawai’i

Twin Keck

How is refractors used

Telescopes that employ lenses to collect and focus light