Types of Spherical Lenses Definition: A piece of a transparent medium bounded by at least one spherical surface, is called a spherical lens. An optical lens is made of transparent material such as glass or clear plastic. One or both surfaces usually have a spherical curve. There are two types of lenses, converging and diverging lenses. A converging lens is called a convex … [Read more...] about What are the Types of Spherical Lenses
Physics
What is Newton’s Disc
What is Newton's Disc Newton’s disc is a coloured disc which is painted with the colours of white light [i.e., violet, indigo, blue, green, yellow, orange, and red (VIBGYOR)] in equal proportions so that when it is rotated very fast, the disc appears white. This is because of a property of our eyes called persistence of vision. This means that an image formed by the eye … [Read more...] about What is Newton’s Disc
How is Colour Formed
How is Colour Formed Take a CD (compact disc) out in the sun and see how light is reflected from its shining surface. What do you see? Many colours. These colours actually come from the sunlight. White light is composed of many colours. When these colours combine, they look white. One way of showing that white light is composed of different colours is to make white light … [Read more...] about How is Colour Formed
What is a Lens
What is a Lens A lens is a curved and polished piece of glass or any other transparent material. The most common place where you will find lenses is in spectacles. You will also find lenses in magnifying glasses, binoculars, and in cameras. Fig. Lenses used in spectacles Common lenses are of two types: convex and concave. A convex lens is thicker in the middle than at … [Read more...] about What is a Lens
Image Reflection by a Plane Mirror
Image Reflection by a Plane Mirror Can you think of a plane reflecting surface? The mirror on the dressing table is a good example of a plane reflecting surface. Any smooth polished surface that can reflect the rays of light and form a clear image is called a mirror. Any highly polished metal surface, e.g., a steel plate or still water. If you look at yourself closely … [Read more...] about Image Reflection by a Plane Mirror