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 ________.
(a) Most of the refraction of light rays entering the eye occurs at the outer surface of the cornea.
(b) The part of eye sensitive to light is retina.
(c) The part of eye which alters the size of the pupil is iris.
(d) When light is dim, the pupil becomes large.
(e) The iris controls the amount of light entering the eye.
(f) The ciliary muscles control the shape of the eye lens.
(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 thinner.
(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 thicker.
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- Part of the eye which controls the entering of light is called$(a)$. iris $(b)$. cornea$(c)$. lens $(d)$. retina
- 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.
- Which of the following controls the amount of light entering the eye?(a) ciliary muscles (b) lens (c) iris (d) cornea
- Part of the eye which controls the entering of light is called(I)Iris (ii) Cornea (iii) Lens (iv)Retina
- 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.
- (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.
- How is the amount of light entering the eye controlled?
- (a) What happens to the size of pupil of our eye (i) in dim light (ii) in bright light?(b) Name the cells on the retina of an eye which are sensitive to (i) bright light (ii) dim light (iii) sensation of colour.
- Give the scientific names of the following parts of the eye:(a) carries signals from an eye to the brain.(b) muscles which change the shape of the eye-lens.(c) a hole in the middle of the iris.(d) a clear window at the front of the eye.(e) changes shape to focus a picture on the retina.
- 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) 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?
- What changes take place in the shape of eye-lens:(a) when the eye is focused on a near object?(b) when the eye is focused on a distant object?
- What is the name of:(a) the curved, transparent front surface of the eye?(b) the light-sensitive layer in the eye?
- Which part of the eye contains cells which are sensitive to light?
- 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
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