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Light is electromagnetic radiation within a certain part of the electromagnetic spectrum. In the previous academic years, students have studied about the fundamentals, but in class 9, the concepts are taken one notch higher. The chapter discusses explains how light is reflected.
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- Optics
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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
Get solutions of ICSE Class 9 Concise Physics Selina Chapter 7: Reflection of Light. Clear your Physics doubts instantly & get more marks in Physics exam easily. Master the concepts with our detailed explanations & solutions.
Get solutions of Class 9: ICSE Concise Physics Selina book 2025 Syllabus. Chapterwise solutions with answers as per latest marking scheme of ICSE to help students score more marks in Physics exam 2025.
Jan 29, 2018 · Solution 9: A ray of light is the path along which light travels. Solution 10: Three distinctions between light and sound waves are. Light waves can travel through vacuum while sound waves cannot. Light waves are transverse waves while sound waves are longitudinal waves.
Selina solutions for Mathematics Concise Physics Class 9 ICSE CISCE 7 (Reflection of Light) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.
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Our CISCE Selina solutions for Physics ICSE Class 9 cover everything from Measurements and Experimentation, Motion in One Dimension, Laws of Motion, Pressure in Fluids and Atmospheric Pressure, Upthrust in Fluids, Archimedes’ Principle and Floatation, Heat and Energy, Reflection of Light, Propagation of Sound Waves, Current Electricity ...
