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Why does the sky appear dark instead of blue to an astronaut?

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Why does the Sun appear reddish early in the morning?

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Explain why the planets do not twinkle?

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Why do stars twinkle?

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What happens to the image distance in the eye when we increase the distance of an object from the eye?

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Why is a normal eye not able to see clearly the objects placed closer than 25 cm?

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Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m.

asked Dec 14, 2021 in Human Eye and Colourful World by Doubtly (98.9k points)

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The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to

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A person needs a lens of power -5.5 dioptres for correcting his distant vision. For correcting his near vision he

asked Dec 14, 2021 in Human Eye and Colourful World by Doubtly (98.9k points)

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The change in focal length of an eye lens is caused by the action of the (a) pupil (b) retina (c) ciliary muscles(d)iris

asked Dec 14, 2021 in Human Eye and Colourful World by Doubtly (98.9k points)

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The least distance of distinct vision for a young adult with normal vision is about (a) 25 m (b) 2.5 cm (c) 25

asked Dec 14, 2021 in Human Eye and Colourful World by Doubtly (98.9k points)

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The human eye forms the image of an object at its (a) cornea (b) iris (c) pupil (d) retina

asked Dec 14, 2021 in Human Eye and Colourful World by Doubtly (98.9k points)

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The human eye can focus objects at different distances by adjusting the focal length of the eye lens

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A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is

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What is the far point and near point of the human eye with normal vision?

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A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective

asked Dec 14, 2021 in Human Eye and Colourful World by Doubtly (98.9k points)

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What is meant by power of accommodation of the eye?

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Explain the following. (a) Why is the tungsten used almost exclusively for filament of electric lamps?

asked Dec 14, 2021 in Electricity by Doubtly (98.9k points)

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An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is

asked Dec 14, 2021 in Electricity by Doubtly (98.9k points)

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Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?

asked Dec 14, 2021 in Electricity by Doubtly (98.9k points)

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