Iris controls the amount of light entering into the eye.
The colored bit is called the iris, and is actually a muscle. it expands and contracts to make the pupil (black bit) either smaller or larger, depending how much light there is. the brighter the outside would is, the smaller the pupil gets.
PUPIL. It automatically becomes smaller due to contraction of Circular muscles via action of Parasympathetic nerve fibers, if light is more. And becomes bigger in size, if light is less due to contraction of the Radial muscles, via Sympathetic nerve fibers. This happens in order to protect Retina from excessive light. When there is total Solar eclipse and you go on looking at Sun, pupil will not contract and Retina gets excessive radiation from the surrounding of Sun and there by burning Retina, with permanent damage to it, causing total blindness.
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Most vehicles use a light sensor to detect the ambient light level and automatically turn on the daytime running lamps when it gets dark. This sensor is usually located on the dashboard or near the rearview mirror.
Yes, Mars receives about half the amount of sunlight that Earth does due to its greater distance from the sun. Additionally, Mars has a thinner atmosphere that scatters and absorbs some of the sunlight that reaches the surface, further reducing the amount of light that reaches the ground.
The diaphragm located under the stage of a microscope controls the amount of light that reaches the slide. Adjusting the diaphragm controls the size of the opening and therefore the intensity of the light passing through the slide.
It has different sized holes and is used to vary the intensity and size of the cone of light that is projected into the slide
The liitle amount of sunlight gets to the understorey of a tropical rainforest and the forest floor gets the slightest amount of light
Your pupil gets smaller or gets bigger depending on the amount of light. If theres a lot of light it gets small to only let some in. If theres only a little light it gets big to let more in.
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The iris is the colored area in the eye and is surrounded by the sclera,the white section in the human eye.The absence of iris affect vision. Its function is important because it is responsible for regulating the amount of light that enters the eye..Too much or too little light that gets into the eye hampers vision,.It controls the amount of light that enters the eye by opening and closing the pupil.
Our pupils adjust to absorb enough light to see, but not so much that it damages our eyes. So when a bright light is shined in the eye, the pupil closes so that the eye isn't damaged. That's why doctors make you wear sunglasses after they dilate your eyes.
The colored bit is called the iris, and is actually a muscle. it expands and contracts to make the pupil (black bit) either smaller or larger, depending how much light there is. the brighter the outside would is, the smaller the pupil gets.
1) The amount of light the plant gets. 2) The temperature. 3) The amount of CO2 in correspondence with the amount of oxygen.
PUPIL. It automatically becomes smaller due to contraction of Circular muscles via action of Parasympathetic nerve fibers, if light is more. And becomes bigger in size, if light is less due to contraction of the Radial muscles, via Sympathetic nerve fibers. This happens in order to protect Retina from excessive light. When there is total Solar eclipse and you go on looking at Sun, pupil will not contract and Retina gets excessive radiation from the surrounding of Sun and there by burning Retina, with permanent damage to it, causing total blindness.
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The iris is the coloured membrane in the eye that controls the amount of light entering the eye by expanding and contracting. The pupil is a hole in the centre of the iris. By expanding, more light will enter the pupil and by contracting less light will enter the pupil.http://en.wikipedia.org/wiki/Iris_(anatomy)