What kind of lens can be used to produce a real image a virtual image?
convex lens
In what kind of surfaces can we see a clear reflected image of an object?
Answer. we should use a smooth surface like mirror . as mirror surface is smooth there is no roughness in the surface and than reflection ray will be equal to incidence ray and light will travels straight.
What is a plano-convex lens used for?
Plano-Convex lenses are the best choice for focusing parallel rays of light to a single point. They can be used to focus, collect and collimate light. The asymmetry of these lenses minimizes spherical aberration in situations where the object and image are located at unequal distances from the lens.
How can you tell if a Plano is a convex lens?
…of two simple lenses, usually plano-convex (flat on one side, outward-curved on the other, with the curved surfaces facing each other).
Why do we use plano-convex lens in Newton ring?
Newton’s rings seen in two plano-convex lenses with their flat surfaces in contact. One surface is slightly convex, creating the rings. In white light, the rings are rainbow-colored, because the different wavelengths of each color interfere at different locations.
Why sodium light is used in Newton ring?
Sodium light consists of a single wavelength of 5892 A where 1 Angstrom equals 1 * 10E-10 m. So the sodium light can produce well defined fringes. (Actually, the sodium light consists of 2 wavelengths, but they are very close together and suitable for the Newton’s rings experiment.)
Why in Newton’s rings setup the beam splitter mirror is kept at 45?
The angle between the incoming ray and the glass plate is 45 degree to make turns the light rays to 90 degrees and that’s why the rays fall normally on the plano-convex lens. Finally forms circular rings.
Why do we keep a semi silvered glass plate at 45 degrees?
When placed at a 45-degree angle, the plate will transmit most of the light, but reflect a small amount at a 90-degree angle to the incident beam. Plate beamsplitters are, as the name implies, optical crown glass plates having a partially silvered coating designed to produce a desired transmission-to-reflection ratio.
Why fringes are circular in Newton rings?
The path difference between the reflected ray and incident ray depends upon the thickness of the air gap between lens and the base. As the lens is symmetric along its axis, the thickness is constant along the circumference of a ring of a given radius. Hence, Newton’s rings are circular.
Why Newton’s ring is circular in shape and what will happen if we use white light instead of sodium light?
Newton’s rings scene in Plano-convex with their flat surface in contact.in white light the Rings are Rainbow colours because different wavelength of each colour interview at different location. when white light is used in Newton’s ring experiment circular rings of rainbow colour will appear….