Cornea in human eye
is composed of proteins and cells.
The correct answer is is composed of proteins and cells.
The cornea is the transparent front part of the eye's outer coat, made of epithelial and endothelial cell layers and a stroma of regularly arranged collagen (protein) fibres. This orderly structure and the absence of blood vessels keep it transparent; it is nourished by tears and aqueous humour.
The light-sensitive screen is the retina, the muscular diaphragm is the iris, and the cornea is avascular.
Short trick: Cornea = clear and bloodless — which is why corneal grafts are rarely rejected.
Myopia is a defect in human vision where an image of a
Human eye can see objects at different distances with contrasting illuminations. This is due to
A glass slab of refractive index \(1\cdot5\) is cut in the shape of a parallelepiped \(ABCD\) as shown in the figure. Surface \(BC\) is polished to form a perfect reflector. Light is incident at surface \(AB\) from inside at an angle \(\pi/3\). Which one of the following is the correct angle \(ABC\) (\(\theta\)) such that the reflected light retraces its path?
Statement I: Due to diffused or irregular reflection of light, a closed room gets light even if no direct sunlight falls inside the room.
Statement II: Irregular reflection, where the reflected rays are not parallel, does not follow the laws of reflection.Ramesh cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
Light enters the eye through a thin membrane called
Colour vision in human eyes is the function of photoreceptor cells named
The part of the human eye on which the image is formed is
Myopia is also known as ______.
Part of the eye which controls the light entering, is called as
Which defect of vision is corrected using cylindrical lenses in spectacles ?
Which of the following defects can be corrected by using a convex lens of appropriate power?
A person standing on the bank of a river observes a fish inside the water. He sees the fish_____.