Edexcel GCSE Astronomy telescopes and observatories overview quiz quiz

To magnify the final image for the viewer

To hold the eyepiece firmly in its place

To collect and focus light to form an image

To filter out unwanted colours from the light

A refracting telescope

A Galilean telescope

A Keplerian telescope

A reflecting telescope

It has no chromatic aberration

It always magnifies the image much more

It is always smaller than a refractor

It does not need any eyepiece at all

25

48

1200

30000

It is directly proportional to the diameter itself

It does not depend on the diameter of the objective

It is proportional to the square of the diameter

It is inversely proportional to the objective diameter

3 times

6 times

27 times

9 times

It improves (gets finer) with a larger objective

It gets noticeably worse with a larger objective diameter

It does not depend on the objective diameter in any way

It only ever depends on the eyepiece that is being used

The X-ray and the gamma ray bands of radiation

The optical (visible) and radio windows

Only the ultraviolet and the infrared bands

Every single wavelength across the spectrum

They are far too heavy to be supported on the ground

They must be kept extremely cold to work properly

X-rays and gamma rays are absorbed by the atmosphere

There is no problem with light pollution up in space

It is much cheaper to build and to launch up into orbit overall here

It is far easier to repair and to upgrade once it is in space

It needs no electrical power at all in order to keep working

It avoids atmospheric blurring and can detect blocked wavelengths

It is very expensive and hard to repair or upgrade

It cannot see any faint and distant objects at all

It only ever works properly during the hours of daylight

It is badly blurred by the Earth's own atmosphere

Blurring of the image caused by turbulence in the Earth's atmosphere above the telescope

False colour fringing caused when a lens bends different colours by different amounts

The gradual dimming of very distant stars as their light spreads out over distance

A particular type of motorised mount used to support a large telescope