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 »
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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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 »
Refractive index (n) = 1.5 Speed of light in air = 3x 108 ms-1 Speed of light in water = ? The refractive index is given by n= c / v Substituting the given values in the above equation, we will get v = c / n = 3×108 m/s / 1.5 ∴ v = 2 ×108 m/s …
Refractive index (n) = 1.33 Speed of light in air = 3x 108 ms-1 Speed of light in water = ? The refractive index is given by n= c / v Substituting the given values in the above equation, we will get v = c / n = 3×108 m/s / 1.33 ∴ v = …
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, …
What is Presbyopia? Presbyopia is a common defect of vision, which generally occurs in old age person. A person suffering from this type of defect of vision cannot see nearby objects clearly and distinctively. A presbyopic eye has its near point greater than 25 cm and it gradually increases as the eye becomes older. Causes …
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What is Hypermetropia? Hypermetropia is also knows as long-sightedness, or far-sightedness. Hypermetropia is the condition of the eyes where the image of a nearby object is formed behind the retina. Here, the light is focused behind the retina instead of focusing on the retina. Hypermetropia is mainly caused due to some structural defects in the …
What is Hypermetropia and also write Cause , symptom and correction ? Read More »
What is Myopia ? Myopia or Nearsightedness or shortsightedness occurs when the eye loses its ability to focus on far objects as the lenses do not possess a long focal length. Objects that are near are visible to patients with this defect. the eye would not be able to form an image for far away …
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There are several advantages of our having two eyes instead of one. It gives a wider field of view. A human being has a horizontal field of view of about 150° with one eye and of about 180° with two eyes. The ability to detect faint objects is, of course, enhanced with two detectors instead …
Why do we have two eyes for vision and not just one? Read More »
