Class 10 Physics1)
The muscular diaphragm that controls the size of the pupil is
Iris control the size of pupil.
Class 10 Physics2)
The black opening between the aqueous humour and the lens is called
The black opening between the aqueous humour and the eye lens is called pupil.
Class 10 Physics3)
Near and far points of a young person normal eye respectively are
25 cm and infinity
Near point = 25 cm while far point = infinity.
Class 10 Physics4)
The defect of vision in which the person is able to see distant object distinctly but cannot see nearby objects clearly is called
Hypermetropia is also called long-sightedness or far-sightedness.
Class 10 Physics5)
Myopia and hypermetropia can be corrected by
Concave and convex lens
Myopia is corrected by using of suitable power of concave lens while hypermetropia is corrected by convex lens.
Class 10 Physics6)
Bi-focal lens are required to correct
Bifocal lens are required to correct the presbyopia. Upper point of bifocal lens consists of concave lens used for distant vision while lower point consists of convex lens facilitate near vision.
Class 10 Physics7)
The image formed on the retina of the human eye is
real and inverted
Eye lens is convex in nature. So, image formed by it on the retina is real and inverted.
Class 10 Physics8)
The clear sky appears blue because
violet and blue lights get scattered more than lights of all other colours by the atmosphere.
Violet and blue colour have shorter wavelength. So, they scattered more than lights of other colour by the molecules present in the atmosphere.
Class 10 Physics9)
When light rays enter the eye, most of the refraction occurs at the
outer surface of the cornea
Most of the refraction for light rays entering the eye occurs at the outer surface of cornea which acts a primary lens converging in nature.