Question

Can you see a spectrum ofcolours when light passes through a flat pane of glass or a hollow prism?

Answer 1

No, a spectrum of colours cannot be seen in either case. When white light passes through a flat glass pane, its parallel sides cause the separated colours to bend back and recombine into white light upon exiting. In the case of a hollow prism, the inside contains only air, so light passes straight through without any effective refraction or dispersion.