Explain the function of Iris, Pupil and Retina. Differentiate near point and far point in human eye. [5 MARKS]
Explain the function of Iris, Pupil and Retina. Differentiate near point and far point in human eye. [5 MARKS]
Each point: 1 Mark
1. Iris - It is a dark muscular diaphragm that controls the size of pupil. It is behind the cornea. It is responsible for providing colour to the eye as it contains melanin pigment.
2. Pupil - It regulates and controls the amount of light entering the eye. It is the black opening between aqueous humour & lens. It is black in colour for all humans because it doesn't reflects any colour of light i.e., it absorbs all the colours of light
3. Retina : Thin membrane with large numbers of light sensitive rods and cone cells. The eyelens forms the image on retina. The retina transfers the image to brain via the optic nerve.
Each Difference: 1 Mark
Near point of the EyeFar point of the EyeIt is 25 cm for normal eyeIt is infinity for normal eyeThe minimum distance at which object can be seenIt is the farthest point upto which the eye can seemost distinctly without strainobject clearly
Each point: 1 Mark
1. Iris - It is a dark muscular diaphragm that controls the size of pupil. It is behind the cornea. It is responsible for providing colour to the eye as it contains melanin pigment.
2. Pupil - It regulates and controls the amount of light entering the eye. It is the black opening between aqueous humour & lens. It is black in colour for all humans because it doesn't reflects any colour of light i.e., it absorbs all the colours of light
3. Retina : Thin membrane with large numbers of light sensitive rods and cone cells. The eyelens forms the image on retina. The retina transfers the image to brain via the optic nerve.
Each Difference: 1 Mark
Near point of the EyeFar point of the EyeIt is 25 cm for normal eyeIt is infinity for normal eyeThe minimum distance at which object can be seenIt is the farthest point upto which the eye can seemost distinctly without strainobject clearly
