Question

all formulas in class 10 chapter 11 human eye and colourful world and explain only formulas please​

Answer 1

Answer:

friend, iam in 10th too

but those topics are deleted...

• The ability of the eye to focus on both near and distant objects, by adjusting its focal length, is called the accommodation of the eye.
• The smallest distance, at which the eye can see objects clearly without strain, is called the near point of the eye or the least distance of distinct vision. For a young adult with normal vision, it is about 25 cm.
• The common refractive defects of vision include myopia, hypermetropia and presbyopia. Myopia (short-sightedness – the image of distant objects is focussed before the retina) is corrected by using a concave lens of suitable power.
• Hypermetropia (far-sightedness – the image of nearby objects is focussed beyond the retina) is corrected by using a convex lens of suitable power. The eye loses its power of accommodation at old age.
• The splitting of white light into its component colours is called dispersion.
• Scattering of light causes the blue colour of sky and the reddening of the Sun at sunrise and sunset.