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Retina in a human eye acts like a:
(a)Lens in a camera
(b)Shutter in a camera
(c)Film on a camera
(d)None of these

Answer
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Hint: They are light-sensitive layers of tissue of the eye of the main vertebrates and a few mollusks. The optics of the eye make a focused two-dimensional image of the visual world on the retina, which interprets that image into electrical neural impulses to the brain to create visual perception.

Complete answer:
The back of the eye is lined by a layer called the retina, which acts just like the film inside a camera. The retina is the innermost layer of the eye which consists of the sclera and the choroid as well. It is light sensitive and acts as a film of a camera. Three layers of neural cells are situated in them, which are ganglion, bipolar, and photoreceptor cells. It changes the image into electrical nerve impulses for visual perception through the brain. When the light finally strikes the retina, an electrical signal is shipped to the brain (the visual cortex) via the optic nerve. The retina serves a function analogous to that of the film or image sensor during a camera.

Additional Information: The neural retina comprises various layers of neurons interconnected through synapses and is supported by an outer layer of pigmented epithelial cells. The first light-sensing cells in the retina are the photoreceptor cells. They are of two types which are rods and cones. Rods function mainly in dim light and supply black-and-white vision. Cones function in well-lit conditions and are liable for the perception of colour, also as high-acuity vision used for tasks like reading. The third type of light-sensing cell, the photosensitive ganglion cell, is essential for getting circadian rhythms and reflexive responses such as the pupillary light reflex.
So, the correct answer is ‘Film on a camera’.

Note: In vertebrate embryonic development, the retina and the optic nerve arise as outgrowths of the developing brain, particularly the embryonic diencephalon. Therefore the retina is investigated part of the central nervous system (CNS) and is actually brain tissue. It is the sole part of the CNS which will be visualized non-invasively. As a similar camera, if the film is bad in the eye (i.e., the retina is damaged or diseased), no matter how well the rest of the eye is working, a good picture will not come.