A ray of light, incident obliquely on a face of a rectangular glass slab placed in the air, emerges from the opposite face parallel to the incident ray.At what distance from the mirror should a screen be placed in order to obtain a sharp image? What will be the nature and the size of the image formed? Draw a ray diagram to show the formation of the image in this case. An object 2 cm in size is placed 30 cm in front of a concave mirror of focal length 15 cm.Draw the following diagram in your answer book and show the formation of the image of the object AB with the help of suitable rays.What is the meaning of this statement in relation to the speed of light? The refractive index of diamond is 2.42”.At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens? Also, calculate the size of the image formed. A concave lens has a focal length of 20 cm.The refraction of light occurs when a ray of light moves from one medium to another and it changes its direction of travel. In other words, the ray of light approaching any surface results in the reflection of the light. The reflection of light occurs whenever a ray of light falls on a smooth polished surface and bounces back.
The major difference between the two is: Credit: SlideShare Light Reflection and Refraction are two different properties of light.
So, all the colours get scattered in different directions to create white colour. Clouds look White because the cloud’s water droplets are much larger than the wavelength of light.So, the red light dominates during a Sunset. The Sunset is Red because when the sunset happens, the sky has already scattered most of the blue light as it has travelled around the atmosphere since the day.Concave mirrors are the reflecting objects that are used in reflecting telescope. A concave mirror can be compared to the inside of the spoon. Here is a formula to calculate the number of images for diffused reflection of light: Concave MirrorĪ spherical mirror, whose reflecting surface is curved inwards, that is, faces towards the centre of the sphere, is called a concave mirror. The number of images becomes infinite when the angle between the two mirrors is zero i.e, they are parallel. If we decrease the angle, the number of images get increased. The number of images varies as per the angle between two mirrors. Infinite images will be formed in multiple reflections, as each image is the result of another image. This type of reflection is only possible when the intensity of the light becomes so low that we cannot see it. Due to this minimal variation, we can say that all the haziness and the blurriness is completely gone.įor both regular and diffused reflection of light, a single mirror is used while when we take two mirrors, a single source of light can be reflected multiple times. As it is coated, the surface totally reflects all the light which falls on it i.e, there is not much variation in both the angles of reflection at multiple points. This mirror used for reflection of light is not the regular mirror we see around us, rather it is a glass which is heavily coated with a uniform layer of highly reflective material such as a powder. Regular Reflection can also be referred to as Specular Reflection and is simply understood by using a plane mirror. Following are the main three types of reflection:Īlso Read: Class 12 Physics Chapters Regular Reflection Whenever we change the basic elements or the form of basic elements involved in this phenomenon, the result also varies. While exploring the basics of the reflection of light, it is also important to go through the different types of reflection.
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