Here is a compilation of Free MCQs of Class 10 Science Book Chapter 10 – Light Reflection and Refraction.. Students can practice free MCQs as have been added by CBSE in the new Exam pattern. Class 6 Science Chapter 11 MCQ (Multiple Choice Questions) of Light, Shadows and Reflections. The amount of light reflected by an object, and how it is reflected, is highly dependent upon the smoothness or texture of the surface. When light falls on rough opaque objects,most part of this light is absorbed and changed into heat energy.A black surface absorbs most of the light. What happens if we use two mirrors? Highly polished surfaces such as mirrors are opaque because most of the visible light is reflected, none is transmitted and very little is absorbed c. Why do we see the road, or a pen, or a best friend? At each point where the light interacts with the surface, the reflected light beam will not be altered or changed in color just as in the previous example. The manner in which the incident light interacts with the object depends on the frequency of light and the nature of the atoms. CBSE Class 10 Science Book Chapter 10 “Light- Reflection and Refraction” Multiple Choice Questions (MCQs) with Answers. The second one. (b) The reflected light from the object. Our eyes are sensors. This phenomenon will make the sample appear lighter in shade or appearance. 3. Multiple Reflection. Only reflected light or direct light from luminous objects can enter the eye and be interpreted. To be precise, we don't “see” with our eyes any more than a thermometer ”feels” the temperature. Reason: All the light falling on the object is absorbed and only black light is reflected from it. Assertion: Lateral displacement is the distance between incident ray and the emergent ray. When a light wave falls on a surface, it is either reflected, transmitted or absorbed. When reflected off a flat mirror, light bounces off at an angle equal to the angle it struck the object. The moon is a non-luminous object which does not have its own light. When light from the sun or any source falls on an object, we are able to see the object because the light reflected by the object reaches our eyes. Reason: The wider the glass slab, the larger the lateral displacement. The non-luminous objects can be seen only when light coming from a luminous object falls on them. When a light wave strikes an object, it can be absorbed, reflected, or refracted by the object. When surface imperfections are smaller than the wavelength of the incident light (as in the case of a mirror), virtually all of the light is reflected equally. We see a clear reflection in the mirror. Required accessories: A reflector or mirror, a piece of wood, one page of paper, one steel plate, one plastic plate and one torch light. Procedure: At first hold a mirror vertically opposite to a white wall. All objects obey the law of reflection on a microscopic level, but if the irregularities on the surface of an object are larger than the wavelength of light, which is usually the case, the light reflects off in all directions. You cannot see light objects themselves, but you can see their effects on any patch and surface objects present in the axes containing the light. Browse more Topics under Light Shadows And Reflections. Euclid (c. 300 bce), in his Optics, presented a law of reflection and discussed the propagation of light rays in straight lines. Calculate the angle of refraction of the light … Sun is an example of a luminous object. Assertion: Lateral displacement is the distance between incident ray and the emergent ray. A number of functions create these objects, including surf , mesh , pcolor , fill , and fill3 as well as the surface and patch functions. Reason: All the light falling on the object is absorbed and only black light is reflected from it. The reflected light from the mirror will fall on the wall. Light shines onto a surface in what is called an incident ray. Illuminated objects do not produce their own light, but still, we can see them. it would be invisible, because you wouldn't see the object itself, only the light rays reflected off its surface from other objects. The angle that this ray strikes the surface of the object is measured by imagining a line coming out from the surface at the point that the light strikes it, at right angles to the object. 1 1. Specular and Diffuse Reflection. The light bulb will emit light in a variety of directions, some of which will strike the mirror. Take a look out your window: you see everything in the natural world (that doesn't produce its own light) because it reflects the light of the Sun. A single image is formed when an object is placed in front of a mirror. Light … If an object does not emit its own light (which accounts for most objects in the world), it must reflect light in order to be seen. The specular light from light object is evaluated sperately. All objects have a degree of reflection and absorption. Task: The differences in reflection of light on different objects or surfaces. The information received by our brain is processed and we “see” the image in our mings eye. reflected light reaches our eyes then we see the objects. And when this reflected light enters our eyes, we can see the non-luminous object. iv) The common phenomena of light are formation of shadows, formation of images by mirrors and lenses, bending of light by a Reflection works by angles. The figure shows the ray making an angle of 35° with the side of the block. When light falls on a smooth shiny surface,it bounces off in one particular direction.This bouncing off of light is called reflection of light. While talking of reflection, we refer to a smooth surface as a regular surface, and a rough and wavy surface as an irregular surface. First, reflections happen whenever light goes from one material into another. It bounces off the surface at the same angle as it hits it. The reflection plane has nothing to do with the light's reflection. Suppose a light bulb is placed in front of a concave mirror at a location somewhere behind the center of curvature (C). Instead those angles becomes all messed up due to the lights ability to penetrate further inside the cloth before reflected and so getting diffused in all kind of directions., It also has to do with the material used, a mirror is normally coated with a thin metal layer. 3. Common examples include the reflection of light, sound and water waves.The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected. The color of the objects we see in the natural world is a result of the way objects interact with light. Q27. You can make a light's specular power 0 to remove the light reflection from all surfaces. However, due to the texture of the object, light will be reflected at many angles, or reflected diffusely. iii) Light travels in straight line. If the angle of incidence is 50°, then calculate the angle between the incident ray and the reflected ray. Practice all intext as well exercises questions here in the format of … Glass has a refractive index of 1.5. Reason: The wider the glass slab, the larger the lateral displacement. A solid black object absorbs almost all light, while a shiny smooth surface, such as a mirror, reflects almost all light back. Epicurus (c. 300 bce) believed that light is emitted by sources other than the eye and that vision is produced when light reflects off objects and enters the eye. Most objects exhibit diffuse reflection, with light being reflected in all directions. All objects reflect some light to be visible b. It's slightly more complicated. Q28. Sun produces its own light. https://www.olympus-lifescience.com/.../primer/lightandcolor/reflectionintro Reflected - light that bounces off a surface a. Now throw light on the mirror from the torch light. Here is a short video explaining why reflection happens. When light strikes an object, its rays can be either absorbed or reflected. When surface imperfections are smaller than the wavelength of the incident light (as in the case of a mirror), virtually all of the light is reflected equally. Have a look at the following image which shows the outer structure … What is it about objects that let us see them? Luminous objects have the ability to produce their own light. Rays of light reflect, or bounce off, objects just like a ball bounces on the ground. All Things Reflected. Pinhole Camera and Reflection of Light; Illuminated Object. Each individual ray of light that strikes the mirror will reflect according to the law of reflection. i) Light is a form of energy which helps us to see objects. Q27. ii) When light falls on objects, it reflects the light and when the . just like when you look towards a mirror, you see the objects reflected in it, you don't focus on the glass itself, unless there are streaks or specks of dirt on it. The reflection plane only capture the other geometric objects in the scene. Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. A shiny polished mirror bounce the 'light' back at a angle whereas a white cloth will not. Q28. Reflection of Light is the process of sending back the light rays which fall on the surface of an object. This reflection of light is what enables us to see everything around us. 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