Question

3. On which principle
are shadows, images
and eclipses formed? State the principle.​

Answer 1

Answer:

rectilinear propagation of light

Shadows, eclipses and images are formed due to the rectilinear propagation of light.

Explanation:

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Answer 2

Answer:

There is no such principle relate to formation of shadow or image.

But you can say whenever light ray fall on an opaque surface it get absorbed completely, which leads to formation of shadow on the other side of opaque object. Same thing happen with image. In image formation light ray's coming from object intersect at a particular point and forms an image.