Basic unit in the eye of cockroach or insect is

Retina

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Rhabdome

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Corneal facet

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Ommatidium

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Solution

The correct option is D Ommatidium
The compound eyes of arthropods like cockroaches are composed of units called ommatidia.
An ommatidium contains a cluster of photoreceptor cells surrounded by support cells and pigment cells, which form several images combined to form a complete vision.
This kind of vision is known as mosaic vision.

Therefore, the correct answer is option D.

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