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Wait, it is not why. It's how. Shadows are formed because light travels in a straight line. Try to understand it yourself.
second answer: when something come in the way of light it, light is not able to travel anymore. and the areas where is no light, it is dark and we call this dark area as shadow
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How is a shadow formed?
A shadow is formed when light is blocked by an object.
What is the definition of shadow angle?
the angle at which a shadow is formed
Length of a shadow formed in morning midway and evening?
longest
What is a shadow angle?
an angle (that can be on the earth) at which an angle could be formed by the sun.
Why is the shadow formed by piece of grease paper different from the shadow formed by cardboard?
Grease paper is translucent. It let's a bit of light through but not all. Card board is opaque. It lets no light through. Therefore, the shadow cast by cardboard will be darker and more defined whereas the grease paper lets light through, making the shadow lighter and less focused.
