The Human Eye and the Colourful World - Class 10 - Science
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Back Questions - The Human Eye and the Colourful World | NCERT | Science | Class 10
The human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This is due to
(a) presbyopia.
(b) accommodation.
(c) near-sightedness.
(d) far-sightedness.
The human eye can focus on objects at different distances by adjusting the focal length of the eye lens due to (b) accommodation. This adjustment is made by changing the curvature of the lens with the help of the ciliary muscles, allowing us to see objects clearly at various distances.
The human eye forms the image of an object at its
(a) cornea.
(b) iris.
(c) pupil.
(d) retina.
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Sign up nowThe least distance of distinct vision for a young adult with normal vision is about
(a) $25 \mathrm{~m}$.
(b) $2.5 \mathrm{~cm}$.
(c) $25 \mathrm{~cm}$.
(d) $2.5 \mathrm{~m}$.
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Sign up nowThe change in focal length of an eye lens is caused by the action of the
(a) pupil.
(b) retina.
(c) ciliary muscles.
(d) iris.
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Sign up nowA person needs a lens of power -5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (i) distant vision, and (ii) near vision?
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Sign up nowThe far point of a myopic person is $80 \mathrm{~cm}$ in front of the eye. What is the nature and power of the lens required to correct the problem?
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Sign up nowMake a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is $1 \mathrm{~m}$. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is $25 \mathrm{~cm}$.
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Sign up nowWhy is a normal eye not able to see clearly the objects placed closer than $25 \mathrm{~cm}$ ?
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Sign up nowWhat happens to the image distance in the eye when we increase the distance of an object from the eye?
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Sign up nowWhy do stars twinkle?
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Sign up nowExplain why the planets do not twinkle.
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Sign up nowExtra Questions - The Human Eye and the Colourful World | NCERT | Science | Class 10
Answer briefly: (a) How do you perceive the color of an object? (b) Which part of our body helps us in maintaining body balance? (c) How does the eye regulate the amount of light that falls on the retina?
(a) Color perception in humans is facilitated by specialized cells in the retina known as cone cells. There are three types of cone cells, each sensitive to different wavelengths of light: one type for red light, one for green light, and one for blue light. The signals from these cells combine to allow us to perceive a spectrum of colors.
(b) The inner ear plays a crucial role in maintaining body balance. It contains the cochlea and three semi-circular canals, which are specifically designed to help detect and manage balance.
(c) The amount of light that enters the eye is regulated by the pupil, a small opening surrounded by the iris. The pupil dilates (expands) in low light and constricts (contracts) in bright light to control the light intensity reaching the retina.
Which of the following is not a property of water?
A. Colourless
B. Odourless
C. Tasteless
D. Colourful
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Sign up nowColour blindness is due to a defect in:
A) Rods and cones
B) Rods
C) Cones
D) Rhodopsin
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Sign up nowWhen you keep objects very close to the eye, ciliary muscles
A) Expand
B) Contract
C) Remain the same
D) Reflect all the light
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