Draw a labeled diagram of human eye. Write the functions of Cornea, Iris, Pupil, eye lens and retina.
Labeled picture of the human eye.
FUNCTION :--
- Cornea of the eye is the first sight where convergence of light rays takes place.
- Iris is that part of the eye which controls the amount of light entering the eye through the pupil.
- Pupil is a type of small hole through which light enters the eye.
- The eye lens is a convex lens just behind the pupilwhich converges the light rays towards the ratina.
- The ratina is a type of screen in the eye having light sensitive cells where the formation of image takes place.
hope this helps.. :)
- 26
here the functions
Cornea: Cornea is transparent. It is responsible for the refraction of light rays towards the retina. Iris: Iris is a dark, circular muscular diaphragm behind the cornea. It gives the eye its color. It also controls the pupil size and thus controls the amount of light entering the eye. Pupil: Pupil is surrounded by the iris. It regulates and controls the amount of light entering the eye. Retina: The retina is the innermost layer of the eye. It contains an outer pigmented layer and an inner nervous layer which contains the photoreceptors (rods and cons). Cone cells are coned shaped and Rod cells are rod shaped. Optic nerve: The optic nerve connects the eye to the brain. The nerve fibers carry impulses from the retina to the visual cortex. Eye lens: The eye lens is made up of a fibrous, jelly-like material. It is transparent and has biconvex structure. It forms an inverted real image of the object on the retina and also separates the aqueous and the vitreous humours. Vitreous humour: Vitreous humour is clear, semi-solid solid supporting the eye ball. hope it helps u plzzzzzzz thumbs up
- 140
Cornea: Cornea is transparent. It is responsible for the refraction of light rays towards the retina.
Iris: Iris is a dark, circular muscular diaphragm behind the cornea. It gives the eye its color. It also controls the pupil size and thus controls the amount of light entering the eye.
Pupil: Pupil is surrounded by the iris. It regulates and controls the amount of light entering the eye.
Retina: The retina is the innermost layer of the eye. It contains an outer pigmented layer and an inner nervous layer which contains the photoreceptors (rods and cons). Cone cells are coned shaped and Rod cells are rod shaped.
Optic nerve: The optic nerve connects the eye to the brain. The nerve fibers carry impulses from the retina to the visual cortex.
Eye lens: The eye lens is made up of a fibrous, jelly-like material. It is transparent and has biconvex structure. It forms an inverted real image of the object on the retina and also separates the aqueous and the vitreous humours.
Vitreous humour: Vitreous humour is clear, semi-solid solid supporting the eye ball.
- 7
Cornea is transparent. It is responsible for the refraction of light rays towards the retina.
Iris: Iris is a dark, circular muscular diaphragm behind the cornea. It gives the eye its color. It also controls the pupil size and thus controls the amount of light entering the eye.
Pupil: Pupil is surrounded by the iris. It regulates and controls the amount of light entering the eye.
Retina: The retina is the innermost layer of the eye. It contains an outer pigmented layer and an inner nervous layer which contains the photoreceptors (rods and cons). Cone cells are coned shaped and Rod cells are rod shaped.
Optic nerve: The optic nerve connects the eye to the brain. The nerve fibers carry impulses from the retina to the visual cortex.
Eye lens: The eye lens is made up of a fibrous, jelly-like material. It is transparent and has biconvex structure. It forms an inverted real image of the object on the retina and also separates the aqueous and the vitreous humours.
Vitreous humour: Vitreous humour is clear, semi-solid solid supporting the eye ball.
- 2
The front part of the eye (the part you see in the mirror) includes:
- The iris (the pigmented part)
- The cornea (a clear dome over the iris)
- The pupil (the black circular opening in the iris, which lets light in)
- The sclera (the white part)
- The conjunctiva (an invisible, clear layer of tissue covering the front of the eye, except the cornea)
Just behind the iris and pupil lies the lens, which helps to focus light on the back of the eye. Most of the eye is filled with a clear gel, called the vitreous. Light projects through the pupil and the lens to the back of the eye. The inside lining of the eye is covered by special light-sensing cells, together called the retina. The retina converts light into electrical impulses. Behind the eye, the optic nerve carries these impulses to the brain. The macula is a small sensitive area within the retina that gives central vision. It is located in the centre of the retina and contains the fovea.
Eye colour is created by the amount and type of pigment in the iris. Multiple genes inherited from each parent determine a person’s eye colour
- -5
i)Cornea:-refracts incident light.
ii)Iris:-adjust the size of pupil.
iii)Pupil:-controls the light entering the eye.
iv)Retina:-receives optical image and converts it to electrical impulses.
v)Eye Lens:-is behind the pupil. It enables us to see distant objects clearly.
- -6
FUNCTION :--
Cornea of the eye is the first sight where convergence of light rays takes place.
Iris is that part of the eye which controls the amount of light entering the eye through the pupil.
Pupil is a type of small hole through which light enters the eye.
The eye lens is a convex lens just behind the pupilwhich converges the light rays towards the ratina.
The ratina is a type of screen in the eye having light sensitive cells where the formation of image takes place.
- 2
Cornea- serves as the window of eye as light from objects to be seen enters the eye through the cornea.
retina- forms image or acts as a screen for the image of the object.
- -9
- 3
- 1
- 0
- 0
2)Iris=is the dark coloured muscular diaphragm that controls the size of the pupil.
3)lens=it focuses the light rays to form real and inverted image of the object on the retina.
4)retina=is the part where image is formed behind the viterous humour.this retina sends the received image to the brain in the form of electric signals via the optic nerves
- 0
- 0
IRIS ~ Thin circular structure that controls the size an diameter of pupil.
PUPIL ~ The opening of the iris that regulates and controls the amount of light entering the eye.
RETINA ~ Image of any object forms on the retina .
- 0