What is the shape of the shadow when a light touches the edges of the book?

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Square

Circle

Triangle

Rectangle

answer is D.

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Detailed Solution

Here, we have to find the shape of the shadow when a light touches the edges of the book.
We know that when a light source is kept in line just above the object it casts a shadow similar to the ray passing through the two edges of the object.
So, here we will draw the diagram as two rays passing through the source of light touching the edges of a book, as shown below:
Question Image

Thus, we can see that the shadow formed here is a rectangle.
Hence, a rectangular shape is formed when light falls on the book.
So, option (4) is correct.

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