(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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Solution

(a) The focal length of the convex eye-lens can be changed by the action of ciliary muscles, but the focal length of the ordinary convex lens made of glass is fixed.
(b) Cornea, pupil, eye-lens, retina.

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How does the eye-lens differ from the ordinary convex lens made of glass?

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 needs to be made ___

Q. In our eye,if the convex lens produces a inverted image on a retina then how do wee see the erect image of a person?

Statement 1: Hypermetropia is corrected by use of convex lens

Statement 2: The eye lens has to become thick so that it Hypermetropia (hyperopia) also known as farsightedness is a common type of refractive error where distant objects may be seen more clearly than objects that are near is able to bend light coming from a nearby object even more so as to form image at retina itself which a hypermetropic eye is unable to do so we place an extra convex lens which assists the eye lens in further convergence of light.

Q. Name six parts or regions of the eye through which light must pass before reaching the retina.

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(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.

(a) The focal length of the convex eye-lens can be changed by the action of ciliary muscles, but the focal length of the ordinary convex lens made of glass is fixed. (b) Cornea, pupil, eye-lens, retina.

(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.

(a) The focal length of the convex eye-lens can be changed by the action of ciliary muscles, but the focal length of the ordinary convex lens made of glass is fixed.
(b) Cornea, pupil, eye-lens, retina.