Master this deck with 22 terms through effective study methods.
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The first step is to fix a sheet of white paper on a drawing board using drawing pins.
Place a glass prism on the paper so that it rests on its triangular base and then trace the outline of the prism using a pencil.
Pins are fixed at points P and Q on the line PE to observe their images through the other face AC of the prism.
Fix two more pins at points R and S such that the pins at R and S and the images of the pins at P and Q lie on the same straight line.
Join and produce the points R and S, and let these lines meet the boundary of the prism at points E and F, respectively.
The angles marked are the angle of incidence (∠i), the angle of refraction (∠r), and the angle of emergence (∠e).
The narrow slit allows sunlight to fall through, creating a narrow beam of white light.
A beautiful band of colors is observed on a nearby screen as the light exits the prism.
The sequence of colors is Violet, Indigo, Blue, Green, Yellow, Orange, and Red, which can be remembered by the acronym VIBGYOR.
The band of colored components is called the spectrum.
The near point of a normal eye is the smallest distance at which the eye can see objects clearly without strain, typically about 25 cm for a young adult.
Myopia, or short-sightedness, occurs when the image of distant objects is focused before the retina and is corrected using a concave lens of suitable power.
Hypermetropia is a refractive defect where distant objects are seen clearly, but near objects appear blurred, typically requiring a convex lens for correction.
The Tyndall Effect is the scattering of light by colloidal particles, making the path of a beam of light visible when it strikes fine particles in the atmosphere.
The sky appears blue due to the scattering of shorter wavelengths of light by the molecules in the atmosphere.
Stars twinkle due to the atmospheric refraction of light, which causes variations in the light's path as it passes through different layers of the atmosphere.
Planets do not twinkle because they are closer to Earth and appear as small disks rather than point sources of light, resulting in less atmospheric distortion.
As the distance of an object from the eye increases, the image distance also increases, allowing the eye to focus on distant objects.
The angle of deviation is the angle between the direction of the incident ray and the direction of the emergent ray after passing through the prism.
Eye donation can restore vision to up to four corneal blind people, making it a significant act of generosity and compassion.
Eye donors can belong to any age group or sex, but those infected with certain diseases like AIDS or Hepatitis cannot donate.
Eyes must be removed within 4-6 hours after death to ensure they are suitable for transplantation.