Question

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Answer 1

Answer:

1. Image obtained in a pinhole camera is inverted. This happens because the light travels in a straight-line path. Hence light from the upper point of the object when passes through the pinhole and strikes the tracing paper at the lower end and the light from the lower part of the object when passes through the pinhole, strikes the upper end of the tracing paper.

2. Fermat's principle, in optics, statement that light traveling between two points seeks a path such that the number of waves (the optical length between the points) is equal, in the first approximation, to that in neighbouring paths.

Explanation:

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