Human Eye and Colourful World
Top questions
See all →- Why does the sky appear dark instead of blue to an astronaut? The sky appears dark instead of blue to an astronaut because there is no atmosphere in the outer space that can scatter the sunlight. As the... 1
- Why does the Sun appear reddish early in the morning? During sunrise, the light rays coming from the Sun have to travel a greater distance in the earth's atmosphere before reaching our eyes. In... 1
- Explain why the planets do not twinkle? Planets are much closer to the earth and are seen as extended sources. So, a planet may be considered as a collection of a large number of p... 1
- Why do stars twinkle? Stars twinkle due to atmospheric refraction of starlight. As the stars are very far away, they behave as almost point sources of light. A so... 1
- What happens to the image distance in the eye when we increase the distance of an object from the eye? The image is formed on the retina even on increasing the distance of an object from the eye. For this eye lens becomes thinner and its focal... 1
- Why is a normal eye not able to see clearly the objects placed closer than 25 cm? A normal eye is unable to clearly see the objects placed closer than 25 cm because the ciliary muscles of eyes are unable to contract beyond... 1