Question

The shadow of a tree at night due to a suspended light P is shown below. How will the length of the shadow change if bigger lights Q or R are used instead of P but in the same position?

Answer 1

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Answer 2

Answer:

The shadow length will not change if bigger lights Q or R are used instead of P but in the same position.

Explanation:

• Sun is source of light here and it changes its position at different points of time. So accordingly size and shape of the shadow of the tree change.
• Since the position of the sun changes during the day, the size and shape of the shadow of the tree change. At 8:00 am and 3:00 pm, the lengths of the shadows of the tree will be longer than its actual length and is pointed towards West and the East directions, respectively. However, at 12:00 noon, the sun will be just above the tree, so the shadow of the tree will be short.
• The size of the shadow is determined by the distance between the object and the source of light as well as the distance between the object and the shadow.
• Shadows have the ability to change size. The shadow grows larger as the light moves closer to the object. The shadow shrinks as the light moves away from the object. Shadows can change their shape as well.
• The size of the shadow is determined by the distance between the screen casting the shadow and the object, as well as the distance between the light source and the object. The size of a shadow can be smaller, larger, or the same as the size of the opaque object depending on these parameters.