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Jan 22, 2024 · CBSE Class 10 Science Notes Chapter 10 Light Reflection and Refraction. REFLECTION. Reflection of Light: The phenomenon of bouncing back of light into the same medium by the smooth surface is called reflection. Incident light: Light which falls on the surface is called incident light. Reflected light: Light which goes back after reflection is ...
- CBSE Notes for Class 10 Science
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- CBSE Notes for Class 10 Science
Direct the light reflected by the mirror on to a sheet of paper held close to the mirror. Move the sheet of paper back and forth gradually until you find on the paper sheet a bright, sharp spot of light. Hold the mirror and the paper in the same position for a few minutes.
According to the law of Refraction: The Refraction of light occurs when there is a change in the speed of light and when the light rays enter from one transparent medium to another. Speed of light is maximum in vacuum. It is 3 x 108 m/s. Cause of refraction is a change in the speed of light. Some examples of refraction.
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Revision Notes. ss 10 ScienceChapter 10 Light Reflection and RefractionImportant Terms. ight is a type of energy that can be converted into ot. hysical. city in air or vacuum is 3 108 m/s .Rectilinear Propagation of LightLight travels in a straight line in a homogene.
- Introduction to Light – Reflection & Refraction
- Chapter Summary Video
- Laws of Reflection
- Spherical Mirrors
In Class 10 Science Chapter 10 Light, the phenomena of reflection and refraction of light using the straight-line propagation of light are taught to students. Furthermore, optical phenomena in nature are examined. The reflection of light by spherical mirrors is discussed in the chapter so that their applications are studied in real-life situations.
Light: Definition
Light is a form of energy that enables us to see things. Light starts from a source and bounces off objects which are perceived by our eyes, and our brain processes this signal, which eventually enables us to see. Maxwell predicted that magnetic and electric fields travel in the form of waves, and these waves move at the speed of light. This led Maxwell to predict that light itself was carried by electromagnetic waves, which means that light is a form of electromagnetic radiation.
Nature of Light
Light behaves as a: 1. ray, e.g. reflection 2. wave, e.g. interference and diffraction 3. particle, e.g. photoelectric effect According to the concept of wave-particle duality in quantum mechanics, light exhibits both particle and wave nature, depending upon the circumstances. A phenomenon like diffraction, polarisation and interference could be explained by considering light as a wave. A phenomenon like the photoelectric effect is explained by assuming that light consists of particles called...
Light Incident on the Surface Separating Two Media
When light travels from one medium to another medium it either: 1. gets absorbed (absorption) 2. bounces back (reflection) 3. passes through or bends (refraction) When light is incident on a plane mirror, most of it gets reflected, and some of it gets absorbed in the medium.
Characteristics of Light
1. The speed of light is given as c=λμ, where λ is its wavelength and μ is its frequency. 2. The speed of light is a constant which is 2.998×108m/s or approximately 3.0×108m/s. To know more about Properties of Light, visit here.
Reflection of Light by Other Media
A medium that is polished well without any irregularities on its surface will cause regular reflection of light. For example, a plane mirror. But even then, some light gets absorbed by the surface.
Spherical Mirror
Consider a hollow sphere with a very smooth and polished inside surface and an outer surface with a coating of mercury so that no light can come out. Then if we cut a thin slice out of the shell, we get a curved mirror, which is called a spherical mirror.
Relationship between Focus and Radius of Curvature
Focal length is half the distance between the pole and the radius of curvature.
Curved Mirror
A mirror (or any polished, reflective surface) with a curvature is known as a curved mirror.
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Introduction to Light - Reflection & Refraction Light: Definition Lig ht is a form of energ y that enables us to see things. Lig ht star ts from a source and bounces of f objects which are perceived by our eyes and our brain processes this signal, which eventually enables us to see. Nature of Light Lig ht behaves as a: ray, e.g. reflection
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light. 7. (ii) Divergent beam : A group of light rays spreading out from a source of light is called divergent beam of light. (iii) Convergent beam : A group of light rays meeting at a point is called convergent beam 8. of light. 3. Reflection of Light : There are some surfaces which have ability to send the light back in
