Question

(A) what is meant by dispersion ?
(B) describe the formation of rainbow in the sky ?
(C) what is meant by accommodation of eye ? name the part of the eye which helps in this phenomenon and state how does it help .

Answer 1

Explanation:

a.the process by which people or things are spread over a wide area..........

b.A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.

c.The ability of eye lens to adjust it's focal length is called power of accommodation of eye. The process by which the ciliary muscles change the focal length of an eye lens to focus distant or near objects clearly on the retina is called the accommodation of theeye.

Answer 2

Answer:

• A The dispersion of light is the phenomenon of splitting of a beam of white light into its seven constituent colours when passed through a transparent medium. It was discovered by Isaac Newton in 1666. ... Thus the spectrum is a band of seven colours which is obtained by splitting of white light by a glass prism. B. A rainbow is a natural spectrum of sunlight in the form of bows appearing in the sky when the sun shines on rain drops. It is combined result of reflection, refraction and dispersion of sunlight from water droplets, in atmosphere. Always it formed in the direction opposite to the sun. ... Thus, we see a rainbow. C. Accommodation: In medicine, the ability of the eye to change its focus from distant to near objects (and vice versa). ... Accommodation is the adjustment of the optics of the eye to keep an object in focus on the retina as its distance from the eye varies. It is the process of adjusting the focal length of a lens.