Part of the eye which controls the entering of light is called
$(a)$. iris
$(b)$. cornea
$(c)$. lens
$(d)$. retina

Academic Physics NCERT Class 8

Iris is the part of the eye that controls the amount of light entering our eyes.

So, option $(a)$ is correct.

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Updated on: 10-Oct-2022

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Part of the eye which controls the entering of light is called(I)Iris (ii) Cornea (iii) Lens (iv)Retina
Which of the following controls the amount of light entering the eye?(a) ciliary muscles (b) lens (c) iris (d) cornea
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.
The human eye forms the image of an object at its:(a) cornea (b) iris (c) pupil (d) retina
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 ________.
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
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
The size of the pupil of the eye is adjusted by:(a) cornea (b) ciliary muscles (c) optic nerve (d) iris
(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?
Name the part of the retina which is insensitive to light.
Name the part of the eye:(i) that had real, inverted image of the object formed on it.(ii) that controls the amount of light entering into the eye.(iii) that helps in changing the focal length of the eye lens.
(a) Which parts of the eye cause rays of light to converge on the retina?(b) Which part causes the greatest convergence?(c) Which part brings the image into sharp focus on the retina? How does it do this?
How is the amount of light entering the eye controlled?
(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.

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