Light travels in a ____ line. When light hits a ____ surface, the angle of reflection is the same as the angle of incidence. A ____ is formed behind an object when it blocks the light. We see objects around us because light from a light source is ____ from them into our eyes. Sunglasses are ____ - some light passes through them. We measured the angle of incidence with a ____. This allowed us to calculate the angle of ____. When light hits water, it can pass through it. However, the angle of the incident ray changes. This is an example of ____.

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