Let's say we have two blocks resting over a frictionless surface. The two blocks are next to each other and there is contact between them. Even though there is no force trying to push them closer to each other, is there a normal force between the two blocks?

I saw these images of how a telescope works and it seems like it is shrinking the image down to the size of the eye. I don’t understand how that makes the image bigger. My thinking is that shrinking an image makes the image obviously smaller and you lose details. What am I not getting here?

The Stern-Gerlach experiment used a source of silver atoms. Can you explain what moved the silver atoms from the oven to the screen where their impact was visualised? I am not asking for the deviation in trajectory caused by the magnet but simply why the atoms moved toward the screen.

Do we need to insert signs of charges in coulomb's law to find the Forces between two charges ?