Name: Optical Instruments: Spectrometer
Uploaded: 2019-07-19
Duration: 7 min 33 s
Description: The basic function of a spectrometer is to take in light, break it into its spectral components, digitise the signal as a function of wavelength, and read it...

Question

Draw labelled diagram and write working of eye.

Accepted Answer

Eyes are part of the sensory nervous system that reacts to light and allows vision. There are a pair of eyes located in sockets of the skull called orbits. The movement of eyes assisted by the six extraocular muscles. The wall of an eyeball is made up of three layers. The outer wall is relatively tough and white called the sclera. The eye consists of various parts:

Cornea: The anterior part of the sclera is a cornea that serves as a protective covering for the front of the eye, and it also helps in focusing light on the retina at the back of the eye.

Pupil: It is the small aperture in the iris and appears as the black dot in the middle eye. When the amount of light in the immediate surroundings changes, the pupil dilates and constricts like the opening of a camera lens.

Iris: It is the circular and coloured area of the eye which controls the amount of light that enters the eye. When the environment is dark it dilates the pupil to allow more light into the eye and in bright light, it constricts the pupil to enter less light into the eye.

Ciliary muscles: The choroid layer becomes thick in the anterior part of the cornea that forms the ciliary muscles. These muscles hold the lens in positions.

Retina: The inner layer of the eye is known as retina, and it further consists of three layers- ganglion cells, bipolar cells, and photoreceptor cells from inside to outside. The most sensitive part of this retina is the macula. The retina contains the light-sensing cells that sense the light and blood vessels to nourish these cells.

Below is the schematic diagram of human eye.

Draw labelled diagram and write working of eye.

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