.......600 x telescpope?

Question

How far will I be able to see?

You can see the coastline from my bedroom window in the house I will be moving into, Marske TS11, and you can see the Sunderland lighthouse on a clear night which is about 30/40 miles north....

How big will something appear 40 miles away, for instance are you talking about me been able to see the surface of the moon in greater detail - for example!

Answer 1

It depends on the aperture of ur t/scope.

The abs max given by diffraction overlap of 2 distinct points is lambda/d where lambda = wavelength of visible ight and d= diam of objective/mirror. The angle subtended by a 1m object at 40 miles is about 1.6x10^-5 rad..so to resolve an object that size you would need a theoretical aperture of 3.125cm. In  practical terms to read a 1m clock face at 40 miles you would need an objective of about 20cm.

To see/resolve objects on the moon < about 80m across u would need a mirror/objective >4m!

Increasing the mag with a fixed objective only makes for a bigger blur..a bit like using digital zoom on ur digicam or moby!