Week 8: Telescopes

This is caused by the slowing down o flight as it passes into a more dense medium. Light then speeds up as it passes out of the medium.

This is caused by the spreading out of light as it passes by the edge of an object.

This is caused by different colours being refracted by different amounts as white light passes into a more dense material.

What is the correct order of increasing wavelength of electro-magnetic energy?

If we want to observe gamma rays we must put what into space?

Only what make it to the surface of the earth, most others are absorbed by the Earth's atmosphere.

When a single objective lens refracting telescopes focus different colours to different focal points; it is a major defect in refractors. What is this?

What can be fixed by adding additional lenses such that each extra lens allows one more colour to come to a common focal point?

What causes light from the edge of the lens to come to a different focal point compared to central beams of light. This defect can be corrected by adding a second lense to a refracting telescope?

What are expensive to make because we must make mulitple large lenses to correct aberrations and because they require very pure glass free of defects to avoid distorted images?

What uses a mirror to gather light. A mirror doesn't suffer from chromatic or spherical aberration if its mirror shape is slightly modified (parabolized.)?

What are cheaper to make because they only require on elarge optical surface to be produced and the mirror can be made of light weight material since only the fron tsurface is used to direct light?

What become clearer the bigger the telescope diameter because of decreased diffraction?

The resolution of a telescope is directly related to the colour of light you are observing and inversely proportional to its diameter....the equation is what?

What means the ability to seperate two points of light so they are seen as distant from each other?

A one meter telescope can see stars 4x dimmer than a 50cm scope because stars can't be:

10 x 80 binoculars are most useful for night viewing because the exit pupil is:

A single wire strung between two poles can act as a:

In a radio telescope, radio waves make what move in the wire and we can then detect it as electricity?

What generally have poor resolution because radio waves have wavelengths on the order of kilometers?

We can improve what of radio telescopes by combining widely sperated dishes electronically and using an atomic clock.

What allows a telescope to compensate for the turbulent air above them and produce near perfect star images?

Astronomers want telescopes to what? (Two options)

We want to observe at different wavelengths because each wavelength represents different kind of events: Molecules mean?

We want to observe at different wavelengths because each wavelength represents different kind of events: Atoms mean?

We want to observe at different wavelengths because each wavelength represents different kind of events: High energy means?

We want to observe at different wavelengths because each wavelength represents different kind of events: Nuclear means?