Explain why refraction occurs at the boundary between two media. A microscope is focused on a mark on a table. When the mark is covered by a plate of glass
3.00 cm thick, the microscope has to be raised 1.1 cm for the mark to be once more in focus
Calculate the refractive index of the glass block.​

Why does refraction occur at the boundary between two media? Refraction occurs at the boundary of two media when light travels from one medium into the other and its speed changes but its frequency remains the same. This is because the light rays leaving the straw change direction when they hit the surface between the liquid and the air.

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