What are the factors that affect the size of a shadow?

the color of the object

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the distance of the source of light

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the angle at which the light rays fall on the object

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the size of the opaque object

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Solution

The correct options are
B
the distance of the source of light

C
the angle at which the light rays fall on the object

D
the size of the opaque object

The size of the shadow depends on the distance of the source of light and the angle at which the light rays fall on the object. If the source of light is closer to the object, a larger shadow is formed and vice-versa. On the other hand, if the angle of incident light is close to $90^{\circ}$ , the shadow is smaller.
The size of the opaque object also affect the size of the shadow. If the source of light is fixed at a point, for a given distance, a small object will cast a smaller shadow and a big object will cast a larger shadow.

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How does the colour of an opaque object affect the colour of the shadow?

Q. Which of these will form a darkest shadow?
(a) opaque object
(b) transparent object
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(d) cannot say because it depends on the source of light

What does these lines mean- the fact that a small source of light casts a sharp shadow of an opaque object points to this straight line path of light, usually indicated as a ray of light.

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