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For simplicity, the ray diagram shown in this figure is that of an older finite-tubelength configuration, but Köhler illumination also holds good for the infinity-corrected microscope (see...
Step One: Draw a ray, starting from the top of the object, parallel to the principal axis and then through “f” after reflection. Step Two: Draw a ray, starting from the top of the object, through the focal point, then parallel to the principal axis after reflection.
- 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.
Nature has endowed the human eye (retina) with the sensitivity to detect electromagnetic waves within a small range of the electromagnetic spectrum. Electromagnetic radiation belonging to this region of the spectrum (wavelength of about 400 nm to 750 nm) is called light.
A ray parallel to the principal axis (aka optic axis), will (seem to) pass through the focal point F. A ray that (seems to) pass(es) through F’, will end up parallel to the principal axis. A ray that passes through the center of the lens, will continue virtually undeflected.
Apr 10, 2024 · Rules of Ray Diagram for Representation of Images Formed. When a ray strikes the concave spherical mirror while traveling through the center of curvature, it retraces its route. The focus or focal point is traversed by rays that are parallel to the primary axis. Image Formation by Spherical Mirrors
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May 12, 2022 · Revision notes on 5.18 Using Ray Diagrams for the Edexcel A Level Physics syllabus, written by the Physics experts at Save My Exams.
