This bending of light is called "refraction".
Simply said, reflection is the act of light reflecting back when it strikes a medium on a plane. Refraction is the process by which light shifts as it travels through a material, causing the light to bend. The medium receives the light that originally entered it back.
Refraction is the scientific term for this bending of light. It occurs when light travels through one medium and then through another where the speed of the light is different. It occurs when light travels from the air into the glass in the telescope eyepiece or even in your spectacles.
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