Define Human eye ? And difference between concave lens and convex lens?
Answers
Answer:
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Answer:
The eye is an important and one of the most complex sense organ that we humans are endowed with.
Eye: The organ of sight. The eye has a number of components. These components include but are not limited to the cornea, iris, pupil, lens, retina, optic nerve.
The cornea is thin, transparent tissue that covers the front of the eye.
The iris is the colored part of the eye that helps regulate the amount of light that enters the eye.
The pupil is the tiny hole in the centre of the eye through which light enters the eyes.
The lens is the transparent tissue found between the pupil and the retina. The light which enters through the pupil is brought to focus by the lens.
The retina is the nerve layer that lines the back of the eye, senses light and creates impulses that travel through the optic nerve to the brain.
Optic nerve carries impulses from the retina to the brain.
Difference between concave and convex lens?
Solution:
A concave lens has a thinner center and thicker edges.
It spreads the light rays falling on its surface, and that is why it is also called a diverging lens.
The images formed by the concave lens are always virtual, upright, and smaller than the object.
Concave lenses are used in eyeglasses, telescopes, flashlights, side mirrors of cars and motorbikes, movie projectors, etc.
A convex lens is thicker in the middle and thinner at the edges.
It is a converging lens which converges the refracted rays.
The image formed is virtual, and the object appears smaller and at a great distance.
Convex lenses are used in the camera, focus sunlight, overhead projector, projector microscope, simple telescope, magnifying glasses, etc. It is also used for the correction of the problem in long sight.