Definition of Light and Lenses || Different Types of Lenses

In this post, we shall learn about the Definition of Light and Lenses. We shall also learn about Different Types of Lenses. Before we start let’s see what we are going to cover today.

 Definition of Light and Lenses

Definition of Lenses and Different Types of Lenses

Lens: The lens is called the special part of the equilibrium and transparent medium surrounded by two specific geometric layers. The floor can be either spherical or a sphere and the other is flat.
There are two types of lenses; Namely: [1] convex lens or optical lens and [2] Concave lens or optical lens.
[1] Convex Lens or Converging Lens: – The lens between which the coarse and lateral side is relatively thin is called a convex lens.
[2] Concave Lens or Diverging Lens: – The lens between which the narrow and lateral angle is thicker is called the concave or non-opaque lens.

Different Types of Lenses

Depending on the size of the two layers of the lens, each of the convex and concave lenses can again be divided into three classes (Six in Total).
  • [1] Double Convex
  • [2] Plano Convex
  • [3] Concavo Conve
  • [4] Double Concave
  • [5] Plano Concave
  • [6] Convexo Concave
[1] Double ConvexThe lens on which the two floors convex is called the two-dimensional lens. If the curvature radius of the two surfaces of this lens is equal, then it is called the Equilibrium Lens.
[2] Plano ConvexThe one lens that is flat and the other flat is called the Flat Plane.
[3] Concavo ConveA lens that has one-floor concave and another floor convex is called a Concavo Conve. The curved radius of the concave floor of this lens is greater than the curvature radius of the convex floor.
[4] Double Concave: The lens between which the two groups are concave is called the Double Concave Lens. 
[5] Plano Concave: The lens of which one floor is flat and the other floor is concave is called the Plano Concave Lens.
[6] Convex Concave: The lens of which one floor is convex and the other floor is concave is called the Convex Lens.

Light Refraction and Focusing Action

Refraction of Light by a Lens and Focusing Action
A convex or concave lens can be considered as the sum of a few fragmented prisms. In the case of a convex lens, the ground of these prisms is oriented toward the centre of the lens and the farther the angle the farther the prism is from the centre of the lens. Again, when the light passes through the glass prism, it is curved to the ground, and the higher the refractive angle of the prism, the higher the radiation loss. So when transposed through a convex lens, the parallel ray convergence becomes the ray and joins at a point. This is called the focusing action of the lens.  This is why convex lenses are called convergent lenses.
Thus the ground of the prisms in the concave lens lies in the opposite direction from the centre of the lens. In this case, the rays will be opposite. As a result, after being replaced by a parallel ray lens, it seems as if the radius of a point is parallel to the ray. This is why the concave lens is called the apical lens
  • Note: If the refractive image of the medium around the lens is greater than that of the lens material, the above-described operation of the convex and concave lens will be reversed – that is, the convex lens will be distal and the concave lens convergent. Therefore, only a convex lens will be transient and only a concave lens will be removed. The ability of the lens to be distal and transverse depends on the surrounding medium of the lens.

Some Lens Definitions

[i] Centre of Curvature: – Aspherical lens, both Dalai a certain sphere, then they will become part of the centre of the sphere oi the surface Curvature of the Centre says.
[ii] Radius of  Curvature: – Any of the lens surfaces that will be part of the sphere of the sphere’s surface byasardhake Curvature Radius says.
[iii] Principal Axis: – If the lens is spherical, but the plane’s centre of curvature of the two taladutira adding that the line can be found in the lens of the Major Axis too.
[iv] Thin lens: – If the thickness of the lens is smaller than the curvature radius of the two surfaces, then that lens is called a Thin Lens.
[V] Aperture: – Lens, lens byasake rise to.
[Vi] Optical Centre: – a light-ray lens, a plane erupabhabe strike that lens through the refracted second floor emerged from being a time of incident light in parallel is emitted, the lens inside the refracted rays of the direction of the axis that the point at which it intersects the point is called the focus of the lens . In the case of thin lenses, when there is no ray of light through the centre of the lens, there is no deformation or side-ray of the ray.
  • To prove that:the abatalottala and the radius of curvature of the surface at a relatively low alokakendra uttalabatala lens and the lens is positioned on the outside of the main axis.
[Vii] Principal Focus and Focal Length: – If a parallel ray radius falls parallel to the main axis of the lens and falls on the lens, then the ray radiation meets a point on the main axis in the case of the convex lens; Or in the case of a concave lens, it seems to be moving away from a point on the main axis. That point is called the lens’s main focus. The distance from the focus of the lens to the main focus is called the Focus (1) Distance.
  • The Lens has two Main Focuses:- If the two focuses are on the opposite side of the light centre and the medium on both sides of the lens is the same, the first and second focus are at the same distance from the light centre.
[Viii] Focal Plane: – The focal plane of the lens through the main Focus is called the Focus floor of the Lens.
[ix] Secondary Focus: – If a group of parallel rays is angled to the lens at a slight angle with the main axis of the lens, then after focusing, the focus of the convex lens matches the floor, or the focus of the concave lens appears to be devoid of any point in the floor. . This point is called the lens’s Secondary Focus 

Good and Bad Reflection Caused by Convex Lenses

Formation of Real Images and Virtual Images by  Convex Lens
The reflection of an object through a convex lens depends on the four religions of the lens.
  • (i) The direction of the light that passes through the centre of light of the lens, there is no change in its orientation.
  • (ii) The light ray emitted from the object, passing through the convex lens parallel to the main axis, will pass through the main focus after diffraction.
  • (iii) Any light ray passing through the main focus of the convex lens will emit in parallel to the main axis.
  • (iv) If an object is perpendicular to the main axis of the lens, its reflection will also be perpendicular to the main axis.
  • (v) a much smaller image than an object.
  • (vi) a larger image than the object.
  • (vii) Bigger than the object.

The Distinction Between Real and Virtual Images

Real Virtual Images
If the radial rays emitted from a point are reflected or replaced by a second point, then that second point is called the center of the first point. If the distal rays emitted from a point appear to be removed from a second point after reflection or refraction, that second point is called the first point of contraction.
There is a real state of goodwill. So it can be captured on screen; Can be seen with the eyes There is no real state of disrepair. So it cannot be put on screen; Can only be seen with the eyes.
The perturbation created by a lens or mirror is usually inverted (subtracted) relative to the object. The paradox caused by a lens or mirror is usually straight (subtracted) relative to the object.
Linear Magnification: – The lens is formed by the reflection that targets the targets depends on the location of the object larger or smaller than or equal to that of the evolution of the power of the lens.
  • Linear magnification (m) = length of reflection / length of target object
The Convex Lens as a Magnifying glass: – If the target object is within the focus distance of the convex lens, the reflection formed by the lens is larger and straight in size than the object, and so on. Convex lenses are used as a magnifying glass. Looking up from a convex lens very close to the pages of a book makes the characters look bigger. The shorter the focal length of the lens, the greater the magnitude of the reflection. Therefore, convex lenses with very short focal lengths are used as a magnifying glass.
The Easy Way of Recognizing the Lens: – If you look at the other side with a finger very close to the lens, if the image is large and straight in the shape of the finger, then the lens will be convex, and if the image is small and straight, then the lens will be concave.

What is Light Scattering

Definition: – White or multicoloured rasmigucchera, in fact, several letters to divide the light dispersion say. Sir Isaac Newton discovers the scattering of light. He found that when the sun’s rays (white light) passed through the glass prism, it was divided into seven different rays.
[i] Prism: – Prism is defined as the equilibrium and transparent refractive medium limited by three rectangular and two triangular surfaces.
[ii] Refractory Floor: – The ray of light that is exposed to the prism floor and emitted from the floor.
[iii] Outline: – The line on which two refractive surfaces meet together is called the outline.
[iv] Principal Intersection: – The principal intersection of the prism’s perpendicular surface is found, which is the principal intersection of the prism.
[v] Refractive Angle: – The angle at which two refractive surfaces meet is called the refractive angle.
[vi] Land: – The opposite floor of the reflection angle is called the land of the prism.

Dispersion of White Light

  • Testing : – A light ray of white opaque on a refractory floor of a prism with a fine hole in an opaque screen. When the ray of light erupts on a screen from the bottom of another prism, it will be visible on the screen with seven different coloured stripes. At the top of the strip are red, then orange, yellow, yellow, green, blue, dark blue, indigo, and purple, respectively. This multi-coloured stripe is called a spectrum. Prism does not create the color of light – it only separates the light rays of different colors present in white or multi-colored light .
Rainbow: – Rainbow is a natural example of light diffusion. If the atmosphere is freshly rainy, sometimes the opposite direction of the sun can be seen in bowls of different colours, such as a bow – this is called a rainbow. This is due to the dispersion of sunlight by the particles of rain.

What is Spectrum

Definition: – The white light is transmitted through the prism and turns into seven different colours. When you put this luminosity emitted from the prism on the screen, the wide stripe found by the light of those seven different colours on the screen is called spectral.
The first letters of the English name of the alphabet found in the white light scatter are arranged in the alphabetical order of the seven letters, the word ‘ VIBGYOR ‘. Similarly, the word ‘ BeniAshakala ‘ is found in the first letter of the Bangla name (purple, blue, sky blue, green, yellow, orange, and red).
Pure Spectrum: – In separate and clearly visible spectrum white light is seven letters, and the letters of the respective space are occupied, called Pure Spectrum.
Impure Spectrum: – The seven-colour spectrum white light on each other as a result of reading the letters are separate and clearly visible, and the letters do not have their own space, the Spectrum was Incorrect.


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