The reason why we see the sun only a few minutes before the actual sunrise is due to refraction of light. Refraction bends light as it passes through the Earth’s atmosphere, causing the Sun’s image to appear above the horizon ...
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The way to separate colors is by using a prism. When white light passes through a prism, it refracts differently based on wavelength, causing it to separate into its constituent colors—red, orange, yellow, green, blue, indigo, and violet—forming a spectrum.
White light is produced in a tube by heating a filament. The filament, typically made of tungsten, is heated to a high temperature by passing an electric current through it. This causes the filament to emit light across the visible ...
The reason for the elliptical appearance of the Sun and the Moon near the horizon is refraction. When these celestial bodies are close to the horizon, their light passes through a thicker layer of the Earth’s atmosphere, causing their image ...
Fiber optic used in communication works only on the principle of total internal reflection of light. This principle allows light to propagate through the fiber by continuously reflecting off the fiber’s walls, ensuring minimal signal loss over long distances.
The spectacles used for a person suffering from nearsightedness (myopia) are concave lenses. Concave lenses are thinner at the center and thicker at the edges, diverging light rays entering the eye. This helps move the focal point backward onto the ...
A person suffering from farsightedness (hyperopia) has difficulty seeing nearby objects clearly. Hyperopia occurs when light entering the eye is focused behind the retina, causing nearby objects to appear blurry. This condition can often be corrected with convex lenses, which ...
The spectacles used for a person suffering from farsightedness (hyperopia) have convex lenses. Convex lenses are thicker at the center and thinner at the edges, converging light rays entering the eye to focus correctly on the retina. This correction allows ...
Farsightedness in old age occurs because the lens loses its elasticity. This condition, known as presbyopia, results from the gradual hardening of the lens over time, reducing its ability to change shape and focus on close objects. It is a ...
For the treatment of presbyopia, bifocal lenses are used. Presbyopia is caused by the loss of elasticity in the eye’s lens, making it difficult to focus on close objects. Bifocal lenses have two distinct optical powers: one for distance vision ...