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Parts of the Eye

a Which parts...

Question

(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?

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Solution

(a) The cornea and the eye lens are the parts of the eye that cause rays of light to converge on the retina.
(b) The cornea is the part of the eye that causes the greatest convergence because light first enters the eye through the cornea, which is convex.
(c) The eye lens is the part of the eye that brings images into sharp focus on the retina. The eye lens changes its thickness and converging power to focus the images of nearby and distant objects on the retina.

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Name the part of the eye:

(a) which controls the amount of light entering the eye.

(b) which converges light rays to form the image.

(c) on which image is formed.

(d) which carries the image to brain.

(e) which changes the curvature (or thickness) of eye-lens to focus objects lying at various distances.

Part of the eye that helps create a sharp, focussed image on the retina.

Q. 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.......

Q. (a) How do you perceive the colour of an object?

(b) Which part of our body helps us in maintaining the body balance?

(c) How does the eye regulate the amount of light that falls on the retina?

Q. (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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