Last updated at April 23, 2020 by Teachoo. For example, a plane mirror.
This means that we can have almost infinite multiple reflections. The incident light ray which lands upon the surface is said to be reflected off the surface. When a ray of light approaches a smooth polished surface and the light ray bounces back, it is called the reflection of light. It is denoted by:When light is incident on a curved surface and passes through, the laws of refraction still hold true. When this happens, not only do you see the back of your head, you also see innumerable images of yourself. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 10 Physics Light- Reflection and Refraction.
We saw that in Reflection of light, light bounces off the surface But sometimes, light does not bounce off the surface Light goes inside a different medium The figure below shows the reflection of an incident beam on a plane mirror.Specular Reflection refers to a clear and sharp reflection, like the ones you get in a mirror. (ii) The distances measured in the direction of incidence of light are taken as positive and vice–versa. According to new CBSE Exam Pattern, MCQ Questions for Class 10 Science pdf Carries 20 Marks.
It is also the ratio of the sine of the angle of incidence and the sine of the angle of refraction, which is a constant for any given pair of media.
Question 11: Mention one difference between reflection of light from a plane mirror and total internal reflection of light from a prism. Define the principal focus of a concave mirror. Angle of incidence = Angle of reflectionRectilinear propagation of light: Light travels in a straight line between any two points.Any flat and polished surface that has almost no irregularities on its surface that reflect light is called as a plane mirror.If the direction of a ray of light is reversed due to reflection off a surface, then it will retrace its path.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. (iii) The heights above the principal axis of the mirror are taken as positive and vice–versa.
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There are many surfaces that show reflection but not all surfaces show reflection. → Speed of light is maximum in vaccum. 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) All distances are measured from the pole of the spherical mirror. Reflection of Light. It helped me to make my project\(Number\; of \; images = \frac{360^{\circ}}{angle\; between\; mirrors}-1\)
It appears that when travelling obliquely from one medium to another, the direction of propagation of light in the second medium changes. Introduction to Light – Reflection & Refraction. Last Updated on March 20, 2019 By Mrs Shilpi Nagpal Leave a Comment. Question 10: Does the depth of a tank of water appear to change or remain the same when viewed normally from above? This effect can be easily observed when your barber uses another smaller mirror to show you the back of your head. If a perpendicular were to be drawn on reflecting surface, it would be called normal.
This type of reflection is called diffused reflection and is what enables us to see non-shiny objects.A single image is formed when an object is placed in front of a mirror.
The SI unit of power of a lens is dioptre (D). For rough surfaces, the rays incident at slightly different points on the surface is reflected in completely different directions. (i) the incident ray, the reflected ray and the normal (at the point of incidence), all lie in the same plane.
Sometimes even the material of which the surface is made of matters. Spherical lenses formed by binding two spherical surfaces bulging outward are known as convex lenses while the spherical lenses formed by binding two spherical surfaces such that they are curved inward are known as concave lenses.The following table shows image formation by a convex lens.Lens formula: 1/v = 1/u = 1/f, gives the relationship between the object-distance (u), image-distance (v), and the focal length (f) of a spherical lens.Applications such as visual aids: spectacles, binoculars, magnifying lens, telescopes.Power of a lens is the reciprocal of its focal length i.e 1/f (in metre). Answer: Depth of the tank remains the same when viewed normally from above. For example lenses.Spherical lenses are the lenses formed by binding two spherical transparent surfaces together. As you can see the picture given below, that in it the ray is striking the surface and then it bounces back. A plane mirror reflects almost all the light which falls on it. This reflective surface reflects almost all the light incident on it uniformly. Mirrors we use on our dressing tables in our home are plane mirrors.
We see that as we go on decreasing the angle between the mirrors, the number of images goes on increasing. Light: Definition. wave as well as particle.
Usually, the height of the object is taken as positive as it is above the principal axis and height of the image is taken as negative as it is below the principal axis.Size of image can be found using the magnification formula m = h’/h = – (v/u) If m is -ve it is a real image and if it is +ve it is a virtual image.The shortest path need not be the quickest path. A mirror is made of glass which is coated with a uniform layer of a highly reflective material such as powder. “Reflection is the bouncing back of light rays on striking the surface”. This phenomenon is known as refraction of light. This may be due to wear and tear such as scratches and dents or dirt on the surface.
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