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Crystalline Lens

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) Cornea and eye-lens
(b) Cornea
(c) Eye-lens. Our eye lens is a bifocal convex lens which is a converging lens. When light falls on it the lens changes its focal length in such a way that the rays get focused on the retinal wall. Ciliary muscles in the eyes help in chnaging the focal length by altering the curvature of the lens. This is also called power of accomodation.

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Q. (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) 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?

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