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A prism is a solid geometric shape with similar end faces and equal and parallel rectilinear shapes.
- The sides of a prism are always either parallelograms or rectangles.
- It is available in a variety of shapes, including triangles, squares, and rectangles.
- When used for refraction, prisms must be manufactured of a transparent material.
- Refraction of light is a phenomenon in which light bends as it travels from one medium to another.
- When light passes through a glass prism, it refracts both entering and exiting the prism.
- Because the positions of entry and departing (refracting surfaces) are not parallel, the emerging and incident rays are likewise not parallel.
- As it travels through the prism, the light beam deviates.
Ques. What is a prism?
Ans. A prism is an optical device having three rectangular lateral sides and a triangle base. It is used to study the behavior of white light as it passes through a prism. Light bends through the prism at various angles, including refraction, incidence, and deviation.
Ques. What is Light?
Ans. Light, commonly referred to as visible light, is electromagnetic radiation that can be seen with an unaided eye. Visible light is typically classified as having wavelengths in the 400-700 nanometre range, corresponding to frequencies in the 750-420 terahertz range, between infrared and ultraviolet.
Ques. Define refraction of light.
Ans. Refraction of light refers to the bending of a light wave as it travels from one medium to another due to a change in the speed of the light as it travels between the two different media.
Ques. Define reflection of light.
Ans. The phenomenon of reflection of light occurs when a light beam traveling through a medium reaches a smooth polished surface and bounces back to the same medium after striking the smooth surface. The incident light rays striking the surface are reflected back. The ray that bounces back is called the reflected ray.
Ques. What is the dispersion of light?
Ans. The splitting of visible light into its component colors is known as dispersion. Light dispersion is produced by a change in the speed of the light beam (resulting in an angle of deviation) of each wavelength by a different amount.
Ques. What is a refractive index?
Ans. The refractive index of an optical medium is a dimensionless quantity that indicates the medium's ability to bend light. The refractive index describes how much light is bent, or refracted, as it enters a material.
Ques. What is an angle of deviation?
Ans. The Angle of Deviation is the difference between the angles of incidence and refraction of a light beam traveling through the surface between two media with different refractive indices.
Ques. Define prism angle.
Ans. The prism angle, also known as the refracting angle of a prism, is the angle formed by the prism's two refracting faces. This refracting angle of the prism angle is equal to 60° for an equilateral prism.
Ques. On what factors the angle of deviation through a prism depends?
Ans. The angle of deviation through a prism depends on the following factors:
- The prism angle
- The incident angle
- The optical density of the prism's material.
Ques. What happens to the incident ray when it enters the prism?
Ans. When the incident ray enters the prism, it deviates from its original path and bends towards the normal.
Ques. What is magnification?
Ans. Magnification is the process of expanding something's apparent size rather than its actual size. The optical magnification size ratio is used to measure this enlargement. This number, commonly called de-magnification, signifies a reduction in size when it is less than one.
Ques. How does the refractive index vary with wavelength?
Ans. According to the definition of the refractive index, the speed of light is determined as the product of wavelength and frequency, and since the frequency of the light wave is unaffected by the medium, it may be calculated regardless of it. However, due to refraction, the wavelength of the light wave varies. This is the cause of the refractive index's changes with wavelength.
Ques. What is the formula to calculate the refractive index of a medium?
Ans. The refractive index of a material may be calculated using the following formula:
η = \(\frac{c}{v}\)
Where
- ƞ is the refractive index of the medium
- c is the speed of light in air or vacuum
- v is the velocity of light in the medium
Ques. What is the unit of the refractive index?
Ans. The refractive index has no unit. This is due to the reason that it is a ratio of the speed of light in a vacuum to the speed of light in a medium.
Ques. What happens to a ray of light when it passes from an optically denser medium to a rarer medium?
Ans. When a ray of light travels from a rarer medium to a denser medium, it bends towards the normal.
Ques. What happens to a ray of light when it passes from an optically denser medium to a rarer medium?
Ans. When a ray of light travels from a denser medium to a rarer medium, it bends away from the normal.
Ques. White light is made up of seven colors. Which color will travel fastest in the air?
Ans. Since the wavelength of the red light is maximum among all the seven colors. Therefore it travels faster in the air.
Ques. What are the seven colors obtained when light passes through a prism? Which light bends the least and the most?
Ans. The seven colors obtained when light passes through a prism are VIBGYOR.
VIBGYOR stands for Violet, Indigo, Blue, Green, Yellow, Orange, and Red.
Red light bends the least while violet light bends the most.
Ques. What is the cause of the rainbow?
Ans. Sunlight and atmospheric factors combine to produce a rainbow. As the light reaches a water droplet, it slows and bends as it passes from air to denser water. The light bounces off the droplet's interior, splitting it into its constituent wavelengths or colors. A rainbow is formed as light leaves the droplet.
Ques. Why does the white light not split into different colors when it passes through a glass slab?
Ans. When white light goes through a glass slab, it bends at a very small angle and bends only by a very small amount. Because the glass slab has two parallel faces, it may be compared to two prisms inverted. As a result, when the dispersed light at the first surface of the glass slab travels through the inverted prism in the glass slab, it recombines to generate white light.
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