Atelescope has an objective for focal length 800mm and eyepiece of focal 20 mm. it’s magnification will be

40X

Explanation:

M=F/f

M=800/20 ( the units cancel each other )

M=40X.

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d