What kind of lens is present in the human eye?
Human eyes contain convex lenses.
The Human Eye and the Colourful World
Colour of the Sun at Sunrise and Sunset
During sunrise and sunset, light has to travel a longer distance to reach the observer. Loss of energy due to scattering is more for high-frequency waves. Longer wavelength wave has minimum loss due to scattering and can travel long distance. Red color has a longer wavelength, and its intensity reaches the observer more compared to …
Why is the colour of the clear Sky Blue?
The wavelength of red light is about 1.8 times that of blue light. As a result, when sunlight travels through the atmosphere, blue light (which has shorter wavelengths) is scattered by the air’s small particles more intensely than red light. Our eyes are exposed to the scattered blue light.
Why is the colour of the clear Sky Blue?
The wavelength of red light is around 1.8 times that of blue light. As a result, when sunlight travels through the atmosphere, blue light (which has shorter wavelengths) is scattered by the air’s small particles more intensely than red light. Our eyes are exposed to the scattered blue light.
What are delayed sunset and an advanced sunrise?
Advanced sunrise and delayed sunset are phenomena caused due to atmospheric refraction. In this the Sun appears to rise early by 2 minutes and set late by 2 minutes. The diagram below shows this phenomenon. When the rays from the Sun hit the atmosphere they get refracted.
Why do stars twinkle? Explain.
The refraction of starlight by the atmosphere is what causes the twinkling of the stars. Due to the several layers that make up the atmosphere and the constantly changing paths that light rays from the star take, refractive indices are always changing. As a result, the amount of rays entering, the eye’s pupil, and the …
What is a rainbow? Draw a labelled diagram to show the formation of a rainbow.
A rainbow is an arch of colours that may be seen in the sky and is brought about by the sun’s light being refracted and dispersed by rain or other water droplets in the atmosphere. In general, red, orange, yellow, green, blue, indigo, and violet are the colours of the rainbow. Formation: A light beam …
What is a rainbow? Draw a labelled diagram to show the formation of a rainbow. Read More »
What is the recombination of the white light spectrum?
Explanation: Scientists at the time of the 1670s knew that sunshine may produce different hues when it passes through a prism, but it was still believed that the prism creates all seven colours (VIBGYOR) and that sunlight is nothing more than white light. But ISAAC NEWTON disproved this, publishing his findings and studies to show …
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Explain the dispersion of white light by a glass prism using necessary figure.
The splitting of white light into its individual colours is a process known as light dispersion. The spectrum is the collection of seven colours that results from splitting of white light. While the velocities of the individual colours that make up white light are the same in a vacuum, they differ when the light travels …
Explain the dispersion of white light by a glass prism using necessary figure. Read More »
What is prism ?
A prism is a three-dimensional solid object in which the two ends are identical. It is the combination of flat faces, identical bases, and equal cross-sections. The faces of the prism are parallelograms or rectangles without bases. And the bases of the prism could be a triangle, square, rectangle, or any n-sided polygon. For example, …