They are formed as a result of Interference between light wave reflected from upper and lower surfaces of the air films developed between the convex surface of a plano-convex lens and the plane glass plate. … If we do this, then the interference will take place but the shape of the rings will be irregular.
What will happen when the glass plate below the plano convex lens is silvered?
20. What will happen if the glass plate is silvered on its front surface? Ans. The transmitted system of fringes will also be reflected and due to the superposition of the reflected and transmitted (which is also reflected now) systems the uniform illumination will result.
What happens if the glass plate used in Newton’s ring experiment is replaced by a plane mirror?
Q. What if the glass plate is replaced with plane mirror? … Then we will not get interference fringe because the intensity of light reflected from mirror will be so great that it won’t be visible and we will get uniform illumination. Q.
What will be the effect of using a plano convex lens in the Newton rings experiment?
Alternate dark and bright rings formed due to presence of air film when plano-convex lens is placed on glass plate are called Newton’s rings. When a plano-convex surface is placed on a glass plate, an air film of gradually increasing thickness is formed.
What happens when plane surface of plano convex lens is silvered?
Hint: When a plano convex lens is silvered from one end, it acts as a mirror. The final image formation will take after the light ray undergoes reflection once from silvered surface and refraction twice on the lens surface.
What is plano-convex lens?
Plano-convex lenses are positive focal length elements that have one spherical surface and one flat surface. These lenses are designed for infinite conjugate (parallel light) use or simple imaging in non-critical applications. These optic lenses are ideal for all-purpose focusing elements.
What will happen if few drops of water is introduced in the space between the plano-convex lens and the plane glass plate?
Since the gap between the glasses increases radially from the center, the interference fringes form concentric rings. The thickness of the rings decreases as their diameter decreases. … Thus, the diameter of the rings contract when a drop of water is introduced between the lens and the glass plate.
When the liquid is introduced between the plano-convex lens and glass plate the diameter of the rings?
From these equations, it is evident that The diameter of Newton’s rings is inversely proportional to the refractive index. Therefore when a drop of water is introduced between the glass plate and plano-convex lens then the refractive index of the medium between them increases.
Will there be any changes in the interference pattern if the glass sheet used below the Planoconvex lens is changed to a mirror?
If we replace the glass plate with a mirror then, we will not get any interference fringe because the intensity of light reflected from the mirror will be so great that it won’t be visible and we will get uniform illumination.
What is the need of glass plate in Newtons Rings?
Consisting of one plane glass plate and a plano-convex lens which are pressed against each other. The knurled screws allow you to centre the interference rings and to adjust the optimum pressure. With diametrical mm scale; on stand rod.
What will happen if we use a plano-convex lens of small radius of curvature?
Q. What will happen if we use a lens of small radius of curvature? A. Then the rings will be of smaller diameter and there is chance of error while taking the readings.
Why we use plano-convex?
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.
Why we use plano-convex lens of large focal length in Newton ring?
Newton’s rings: The curved surface of the plano-convex lens of large focal length is placed on an optically flat glass plate. … Interference fringes are produced when monochromatic light is incident on the lens.
When the convex side of the plano-convex lens is silvered it behaves like?
A planoconvex lens, when silvered in the plane side behaves like a concave mirror of focal length 30 cm. However, when silvered on the convex side it behaves like a concave mirror of focal length 10 cm.
How will the image formed by a convex lens be affected if the central portion of the lens is wrapped in black paper as shown in Figure?
In the convex lens the rays are converted to a point on the other side lens when the parallel rays are incident on the surface of the lens. If the central portion of the lens wrapped by black paper, full image will be form but with a less brightness.
What is the relation between focal length and radius of curvature of a plano-convex lens?
The focal length of a plano-convex lens is equal to its radius of curvature.