(1) Explain Tyndall effect in earth's atmosphere along with two examples. (2) give the meaning of power of accommodation of eye question mark how does this help us to see object at different distance
Answers
1)Tyndall Effect in Earth's atmosphere can be explained as follows-
The earth's atmosphere contains many particles like water droplets, dust etc which are very minute. When a beam of light falls in these particles, they reflect the light which then reaches to our eyes. Thus the path of the light beam becomes visible to us. This phenomena is called Tyndall Effect.
Example- The sky appears blue in color due to Tyndall effect.
2) Power of accomodation means the ability of the eye of humans to adjust itself so that they can see objects, both near and far. This usually involves the ciliary muscle and the lens.
When a nearby object is to be viewed, the ciliary muscles contract and the lens becomes thick and the focal length decreases.The image falls on the retina.
When a far away object is to be viewed, the ciliary muscles relax, the lens become thinner and the focal length increases. The image falls on the retina.