Introduction to Light – Reflection & Refraction. Here we have given NCERT Class 10 Science Notes Chapter 10 Light Reflection and Refraction. This means that the haziness and the blurring are almost entirely eliminated.Reflective surface other than mirrors, in general, has a very rough finish. For rough surfaces, the rays incident at slightly different points on the surface is reflected in completely different directions. Question 11: Mention one difference between reflection of light from a plane mirror and total internal reflection of light from a prism. In order to study the reflection of light, we need an apparatus which can produce a thin beam of light. 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.When light travels from one medium to another medium it either:When light is incident on a plane mirror, most of it gets reflected, and some of it gets absorbed in the medium.A medium that is polished well without any irregularities on its surface will cause regular reflection of light.
(iii) The heights above the principal axis of the mirror are taken as positive and vice–versa. Home » Class 10 » Light-Reflection and Refraction » Refraction of light. Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. Light: Definition. Question 10: Does the depth of a tank of water appear to change or remain the same when viewed normally from above? (i) light is incident normally on a boundary, (ii) refractive indices of the two media in contact are equal. The greater the ratio, more the bending. The variation of the number of images of an object placed between two mirrors with the angle between the mirrors can be described by a simple formula:Stay tuned with “BYJU’S – The learning app” for more such interesting information with engaging videos!It’s a very good learning app. Refraction of light. → Light has dual nature i.e.
Light is a form of energy that enables us to see things. The SI unit of power of a lens is dioptre (D). This means that we can have almost infinite multiple reflections. We can also see an image at every individual reflection. This reflective surface reflects almost all the light incident on it uniformly. The incident light ray which lands upon the surface is said to be reflected off the surface. (iii) All heights above the principal axis of the lens are taken as positive and vice versa. (i) All distances are measured from optical centre (ii) The distances measured in the direction of incidence of light are taken as positive and vice–versa.
But even then some light gets absorbed by the surface.The incident ray, reflected ray and the normal all lie in the same plane. When this happens, not only do you see the back of your head, you also see innumerable images of yourself. (i) All distances are measured from the pole of the spherical mirror. The following table is for a concave mirror.Concave and Convex mirrors are used in many daily purposes.Distances measured towards positive x and y axes (coordinate system) are positive and towards negative x and y-axes are negative. (i) the incident ray, the reflected ray and the normal (at the point of incidence), all lie in the same plane. All this leads to a loss of both the brightness and the quality of the reflection.In the case of such rough surfaces, the angle of reflection when compared between points is completely haphazard. Since light is always in a hurry, it bends when it enters a different medium as it is still following the quickest path.
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