___is a camera without a lens that works on the principle of rectilinear propagation of light.

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Solution

The pinhole camera works on the principle that light travels in a straight line ie., rectilinear propagation of light. In one of its side it has a small hole through which the light ray travels in a straight line.

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Beginnings	Endings
1. A pinhole camera is	(a) travelling of light in a straight line.
2. Moon and Venus are	(b) natural source of light.
3. Rectilinear propagation of light is	(c) give out light of their own.
4. Luminous objects	(d) based upon the principle of rectilinear propagation of light.
5. Glow-worm is a	(e) illuminating objects.

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