Question

13. Name the natural phenomenon by which sky appears blue.
Or
What type of lens can correct the defect of hypermetropia?​

Answer 1

Scattered in all directions by all the gases and particles in the air makes the sky appear blue.

For the closer objects the rays converge beyond the retina. To make them converge on the retina a convex lens is used.

Explanation:

Sky appears blue during the daytime due to the scattering of light by the molecules of air. Air molecules in the atmosphere scatter the white light from the sun into its components but the blue light being shortest in wavelength hence results in a bluish appearance.

Near the horizon the color is faded blue due to excessive re-scattering of the blue light.

• Hypermetropia is a condition in which a person is unable to see the clearly the objects that are in close range to the observer the cilliary muscles around the eye lens have strained in a contracted position stretching the eye-lens flat to increase its focal length.

• Now for the closer objects also the rays converge beyond the retina. To make them converge on the retina a convex lens is used.

TOPICS: lens, scattering of light

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Answer 2

A) Natural phenomenon by which sky appears blue:

• As a white light ray is incident on a Prism, similarly when the light from the sun is incident on Earth.
• It has to travel through the atmosphere and like in case of prism the Dispersion of light takes place.
• Similarly when the light from the sun enters the atmosphere, the Dispersion of light takes place which gives the colour of the sky to be blue.

B) Type of lens can correct the defect of hypermetropia

• The type of lens that is used in case of hypermetropia is a convex lens.
• The presence of this problem in human eye is due to the feeling of muscle strengthening or loosening of the eyes.
• When the ciliary muscle stretches too much Displacement of the focus of the image on the back of eye fails does needing a convex lens to correct the issue .

To know more;

Mention any two natural phenomena that occurs due to scattering of light

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What are hypermetropia and myopia ? What is their cause ? How are they rectified ?

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