If you see a double image in the microscope, what should you do to correct it?

Make sure that the two eyepieces are the correct distance to each other. Adjust the distance to suit your eyes.

Make sure that the diopter compensation is properly set. ...

Stereo microscopes contain prisms which turn an inverted image right side up.

it takes hundreds of years to become stable.

if you have another question lmk.

the sun creates it's own light, also gives light and life to bunch of stuff like plants,animals,humans etc.photosyntesis is the process of making food which needs sun,water,nutrients etc.