6. How are shadows formed?
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Answers
Shadow: An area of darkness formed by an opaque object obstructing light is called a shadow. Objects can be transparent, translucent, or opaque, depending on how much light can pass through them. A shadow is formed when an opaque object blocks the light falling on it.
Step-by-step explanation:
Shadows are formed due to the rectiliner propagation of light i.e shadows are formed because light travels in straight lines . I should point out that this is a simplified view as demonstrated by diffraction where light does bend around sharp corners. Also, in order for light to travel in a straigt line, it has to travel in vacum or a homogeneous/even medium. Light will bend, as it does when the medium changes and light enters at non-right angle. Or when the medium is uneven, like air close to ground on a hot day. Than there is gravity. According to General Theory of Relatively, mass warps space time and thus light will travel in a "curved" line.