Refraction of light in the eye occurs at:(a) the lens only (b) the cornea only (c) both the cornea and the lens (d) the pupil

(c) both the cornea and the lens

Explanation

Cornea is the front part of the eye-bulging outwards, which is made of a transparent substance, and the outer surface of the cornea is convex in shape. Because of this shape, when the light rays coming from an object enter the eye through the cornea, it just bends or refracts.

Lens or the eye-lens is a convex lens made of transparent, soft, and elastic tissues like a jelly made of proteins, that control the formation of an image on the retina. It is connected with the ciliary muscles that accommodate the eye lens, which means, it changes the shape of the lens to focus the light rays coming from near or distant objects on the retina.

Tutorialspoint

Simply Easy Learning

Updated on: 10-Oct-2022

77 Views

Which of the following controls the amount of light entering the eye?(a) ciliary muscles (b) lens (c) iris (d) cornea
Part of the eye which controls the entering of light is called$(a)$. iris $(b)$. cornea$(c)$. lens $(d)$. retina
The human eye forms the image of an object at its:(a) cornea (b) iris (c) pupil (d) retina
The size of the pupil of the eye is adjusted by:(a) cornea (b) ciliary muscles (c) optic nerve (d) iris
Part of the eye which controls the entering of light is called(I)Iris (ii) Cornea (iii) Lens (iv)Retina
(a) Draw a simple diagram of the human eye and label clearly the cornea, iris, pupil, ciliary muscles, eye-lens, retina, optic nerve and blind spot.(b) Describe the working of the human eye with the help of the above diagram.(c) How does the eye adjust itself to deal with light of varying intensity?
The atmospheric refraction of light causes the twinkling of:(a) planets only (b) stars only(c) planets and stars (d) stars and satellites
Fill in the following blanks with suitable words:(a) Most of the refraction of light rays entering the eye occurs at the outer surface of the ________.(b) The part of eye sensitive to light is ________.(c) The part of eye which alters the size of the pupil is ________.(d) When light is dim, the pupil becomes ________.(e) The iris controls the amount of ________ entering the eye. (f) The ciliary muscles control the shape of the ________.(g) To bring light from a distant object to a focus on the retina of the eye, the convex eye-lens needs to be made ________.(h) To bring light from a near object to a focus on the retina of the eye, the convex eye-lens need to be made ________.
To focus the image of a nearby object on the retina of an eye:(a) the distance between eye-lens and retina is increased. (b) the distance between eye-lens and retina is decreased. (c) the thickness of eye-lens is decreased. (d) the thickness of eye-lens is increased.
The change in focal length of an eye-lens is caused by the action of the:(a) pupil (b) retina (c) ciliary muscles (d) iris
Fill in the following blanks with suitable words:(a) A convex lens _________ rays of light, whereas a concave lens _________ rays of light.(b) Lenses refract light to form images: a _________ lens can form both real and virtual images, but a perging lens forms only _________ images.
The magnification produced by a spherical mirror and a spherical lens is + 0.8.(a) The mirror and lens are both convex (b) The mirror and lens are both concave(c) The mirror is concave but the lens is convex (d) The mirror is convex but the lens is concave
The magnification produced by a spherical lens and a spherical mirror is + 2.0.(a) The lens and mirror are both concave (b) The lens and mirror are both convex(c) The lens is convex but the mirror is concave (d) The lens is concave but the mirror is convex
(a) How does the convex eye-lens differ from the ordinary convex lens made of glass?(b) List, in order, the parts of the eye through which light passes to reach the retina.
Name the part of the eye:(a) which controls the amount of light entering the eye.(b) on which the image is formed.(c) which changes the focal length of eye-lens.

Kickstart Your Career

Get certified by completing the course

Get Started