An astronomical telescope has its two lenses spaced 81.1 cm apart. If the objective lens has a focal length of 78.0 cm , what is the magnification of this telescope? Assume a relaxed eye. Follow the sign conventions.

The magnification is  

Explanation:

From the question we are told that

        The distance between the lenses is  

         The focal length of the objective lens

Generally the  length of the telescope that satisfies the condition for a relaxed eye can be mathematically represented as

Where is focal length of the eyepiece

      Making the subject the of the formula above

Now substituting value

Generally magnification can be mathematically represented as

This negative sign is a reminder that all real image are always inverted

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​