IIT JEE

Lenses are curved and transparent objects that refract light. Convex lenses (bulging outward, converging light rays) and Concave lenses (bulging inward, diverging light rays) are two types of lenses. Cameras, binoculars and telescopes all employ lenses. Lenses such as spectacles and contact lenses are used to correct vision problems such as hypermetropia (long-sightedness) and myopia […]

The lens is a transmitting device that focuses or scatters rays of light by suggesting refraction. A simple lens is made of a single piece of transparent material, whereas a compound lens is made up of multiple simple lenses aligned along a standard axis. A lens will focus light to form an image, as opposed

In most optical instruments, two or more lenses are employed in sequence. The lens formula or ray diagram can be used to determine the final image’s location, size, and nature. In any instance, the picture created by the first lens is located first. The final image created by the second lens can be located by

Introduction Have you ever seen big laboratories with huge equipment to observe stars and planets? These equipment are known as telescopes used to keep heavenly bodies and magnification to explore bounds of outer space that the naked eyes cannot reach. The telescope requires a few lenses to focus on objects and an eyepiece to see

Introduction  Several optical instruments have been designed using the concept of reflection, refraction, lenses, prisms and many more. Telescope is one example of such optical instruments. The first practical telescope was invented at the beginning of the 17th century, using glass lenses in the Netherlands. A basic telescope comprises an objective lens and an eyepiece

What stream to choose after 10th? An astronomical telescope combines two lenses, called the objective lens and the eyepiece, spaced at a distance. It is used to observe distinctive images of celestial bodies such as stars and planets. It is the ratio of the angle 𝛽 subtended at the eye by the image to the

An optical device which is used to diverge or converge Rays is known as lens. There are two types of lens: convex lens and concave lens.  A type of lens which is used to diverge the beam of Light which incident on it is known as diverging lens or concave lens. This lens helps to