Rod and cone cells are part of either retina or eye lens?

Academic Biology NCERT Class 8

The rod and cone cells are part of a delicate membrane called the retina. Rods and cones are light-sensitive cells that respond to the intensity of light and colour of objects, respectively, by generating electrical signals.

Near the centre of the retina, there is an oval-shaped pigmented area, a little region about 5.5 millimetres in diameter that’s responsible for central vision, and is densely packed with photoreceptor cells called rods and cones that respond to light and also send electric nerve impulses into the optic nerve and to the mind.

While the lens is a transparent bi-convex structure which is suspended behind the iris of the eye and functions to focus light rays onto the retina.

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Updated on: 20-Mar-2023

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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.
Part of the eye which controls the entering of light is called(I)Iris (ii) Cornea (iii) Lens (iv)Retina
Part of the eye which controls the entering of light is called$(a)$. iris $(b)$. cornea$(c)$. lens $(d)$. retina
Which part of the eye contains cells which are sensitive to light?
Name two types of cells in the retina of an eye which respond to light.
What will happen if there will be no cone cells in our retina?
When sunlight is concentrated on a piece of paper by a spherical mirror or lens, then a hole can be burnt in it. For doing this, the paper must be placed at he focus of:(a) either a convex mirror or convex lens (b) either a concave mirror or concave lens(c) either a concave mirror or convex lens (d) either a convex mirror or concave lens
(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.
Why eye lens is called crystalline lens?
How does the eye change in order to focus on near or distant objects?(a) The lens moves in or out (b) The retina moves in or out(c) The lens becomes thicker or thinner (d) The pupil gets larger or smaller
You are provided with a concave mirror, a convex mirror, a concave lens and a convex lens. To obtain an enlarged image of an object you can use either$(a)$. concave mirror or convex mirror.$(b)$. concave mirror or convex lens.$(c)$. concave mirror or concave lens.$(d)$. concave lens or convex 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?
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.
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 ________.
Name the part of the retina which is insensitive to light.

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