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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.
Light ray parallel to principal axis. Light ray that passes through optical centre. Locate point where the light rays intersect and draw the top of the image there. hereExample 1:If the focal length of the camera is 10 cm, where should the object be placed. >20cmExample 2:light ray travels into a thin.
- Optics
- Wave Theory of Light
- Modern Quantum Theory of Light
- Electromagnetic Waves
- Source of Light
- Types of Medium
- Ray
- Beam of Light
- Convergent Pencil of Light
- Parallel Pencil of Light
It is the branch of physics that deals with the study of light. It is mainly divided into three parts: 1. Geometrical optics or optics: Geometrical optics, or ray optics, describes light propagation in terms of “rays”. 2. Wave or physical optics:It is concerned with nature of light and deals with interference, diffraction and polarization. Wave mot...
According to the wave theory, light consists of electromagnetic waves. The light waves travel with a very high speed of 3 × 10 8 m/s in vacuum. The wavelength of visible light waves lies between 4 × 10 – 7 m to 8 × 10 – 7 m. The phenomenon of diffraction (bending of light around the corners of tiny objects) interference and polarization of light ca...
Quantum theory tells us that both light and matter consist of tiny particles which have wave-like properties associated with them. Light is composed of particles called photons, and matteris composed of particles called electrons, protons, neutrons. It's only when the mass of a particle gets small enough that its wave like properties show up. To he...
Light, microwaves, x-rays, and TV and radio transmissions are all kinds of electromagnetic waves. They are all the same kind of wavy disturbance that repeats itself over a distance called the wavelength. The waves which do not require a material medium for their propagation are known as electromagnetic waves. e.g. All light waves are electromagneti...
A body that emits light in all directions is said to be the source of light. The source can be a point source one or an extended one. The sources of light are of two types: 1. Luminous source: Any object that by itself emits light is called as a luminous source. e.g. Sun and Stars (natural Luminous sources), Electric lamps, Candles and Lanterns (ar...
When light falls on a medium, it can be treated in three ways. A medium is a substance through which light propagates or tries to do so. Based on this interaction mediums are classified into three categories. 1. Transparent: The medium which allows most of the light to pass through it is called a transparent medium. e.g. Air, Water, Glass etc. 2. T...
A ray of light is the straight line path along which the light travels. It is represented by an arrow head on a straight line . The direction of the arrow gives the direction of propagation of light.Imagining light as a ray makes it easy to describe, with great accuracy, three well-known phenomena: reflection, refraction and scattering. Let's take ...
A light beam or beam of light is a directional projection of light energy radiating from a light source.Sunlight forms a light beam(a sunbeam) when filtered through media such as clouds,foliage, or windows. A group of parallel rays is called a beam of light. It is also called a pencil of light. A pencil of light or a beam of light may be of three t...
Convergent Pencil is also known as convergent beam of light. In this case, as the beam of light progresses the rays converge to a point. Or A convergent Pencil is that in which rays of light propogate to meet at a particular point say O as shown in the figure. Convergent Pencil of light The diameter of the pencil goes on decreasing as the rays proc...
A parallel pencil is that in which all the rays move parallel to one another. The diameter of the pencil remains constant throughout as shown in figure 3. Parallel Pencil of light
The steps to download these Maths notes includes: To download the Reflection of Light Class 9 ICSE notes, visit the official website of Selfstudys. After opening the website, you need to scroll down and find the category of ‘Free Study Materials’. After finding the category, you need to click on the category of ‘CISCE’.
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When light propagates in a transparent material medium, its speed is in general less than the speed in vacuum c. An interesting consequence of this is that a light ray will change direction when passing from one medium to another. Since the light ray appears to be “broken”, the phenomenon is known as refraction.
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Following are the important properties of light –. Light travels in a straight line. The speed of light is faster than sound. Light travels at a speed of 3 x 10 8 m/s. Reflection of light. Reflection is the phenomenon in which light travelling in one medium, incident on the surface of another returns to the first medium, obeying the laws of ...
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Where will the image form when we place an, concave mirror at a point between focus and ce., A. 1) When we place an object on the Principal ax, , concave mirror at a point between focus and, of curvature then the ima, the centre of curvature., , 2) The image is enlarged, inverted and real., 4.
