Question

II.
Give one word for the following:
1. The complete dark portion of shadow-
2. The substance that allow light to pass through them -
3. The source of light that is obtained from nature -
4. A camera that works on the principle of rectilinear propagation of light-

Answer 1

Explanation:

1) umbra

2) transparent

3) Natural light sources

4) Pinhole cameras

Answer 2

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