Class 10 Science - Chapter The Human Eye and the Colourful World NCERT Solutions | Why does the sky appear dark instead of
Why does the sky appear dark instead of blue to an astronaut?
When the sunlight passes through the atmosphere, the fine particles scatters in the atmospheric layers blue light will appear having shorter wavelength and the red light having the larger wavelength. The scattered blue light enters to our eyes if we see the sky from the earth.
The sky does not appear blue to an astronaut because there is no atmosphere in the space and hence the light does not scatter into the various colours as like when we see the colours of sun or sky from the earth. If there is no scattering occurs, the sky will look dark to the astronaut from the space.
More Questions From Class 10 Science - Chapter The Human Eye and the Colourful World
- Q:-
What is the far point and near point of the human eye with normal vision?
- Q:-
Why do stars twinkle?
- Q:-
Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.
- Q:-
Explain why the planets do not twinkle.
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What is meant by power of accommodation of the eye?
- Q:-
The human eye forms the image of an object at its
(a) cornea. (b) iris. (c) pupil. (d) retina.
- Q:-
A student has difficulty reading the blackboard while sitting in the last row. What could be the defect the child is suffering from? How can it be corrected?
- Q:-
The least distance of distinct vision for a young adult with normal vision is about
(a) 25 m. (b) 2.5 cm. (c) 25 cm. (d) 2.5 m.
- Q:-
A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision?
- Q:-
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.
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