In this post, we shall learn about Light and Lenses. We shall also learn about Different led lens types. Before we start let’s see what we are going to cover today.
What is Light and Lenses
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:  convex lenses or optical lenses and  concave lenses or optical lenses.
-  Convex Lens or convergent Lens : The lens between which the coarse and lateral side is relatively thin is called a convex lens.
-  Concave Lens or divergent 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.
3 Types of Convex Lens
- (1) Double Convex : The 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 Convex : The one lens that is flat and the other flat is called the Flat Plane.
- (3) Concavo Convex : A 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.
3 Types of Concave Lens
- (1) Double Concave : The lens between which the two groups are concave is called the Double Concave Lens.
- (2) Plano Concave : The lens of which one floor is flat and the other floor is concave is called the Plano Concave Lens.
- (3 ) Convexo Concave : The lens of which one floor is convex and the other floor is concave is called the Convex Lens.
Refraction of Light Through Lenses
Convex Lens Refraction Rules
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 center of the lens and the farther the angle the farther the prism is from the center 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.
Use of Convex lenses examples :
- Human Eye.
- Magnifying Glasses.
Concave Lens Refraction Rules
Thus the ground of the prisms in the concave lens lies in the opposite direction from the center of the lens. In this case, the rays will be the 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.
Use of Concave lenses examples
- Binoculars and telescopes.
- Eye Glasses to correct nearsightedness.
What Kind of Image is Formed by Concave Lenses
let us learn about image formation by concave lenses. The following rays of light are considered while constructing ray of light diagrams for locating the images formed by a concave lens for the various positions of the object.
An incident ray of light coming from the object parallel to the principal axis of a concave lens after refraction appears to come from its focus.
An incident ray of light passing through the optical center comes out of the lens without any
deviation. A concave lens always gives a virtual erect and diminished image whatever may be the position of the object.
Let us now draw ray diagrams to show the position of the image when the object is placed at infinity and between o and f1 and any position between infinity and o.
when the object is at an infinity array of light coming from the object parallel to the principal axis, an incident ray after refraction diverges and appears to come from its focus. A ray of light passing through the optical, an incident ray after passing through the optical center comes out of the lens without any deviation.
So the image formed is At f1
When the object is placed between O and f a ray of light from the object parallel to the principal axis. An incident ray after refraction diverges and appears to come from its focus, a ray of light passing through the optical an incident ray after passing through
optical center comes out of the lens without any deviation.
So the image formed is between o and f1
When the object is placed at any position between o and infinity a ray of light comes from the object parallel to the principal axis an incident ray after refraction diverges and appears to come from its focus. A ray of light passing through the optical, an incident ray after passing through the optical center comes out of the lens without any deviation. So the image formed is between o and f1 erect virtual diminished.
Different Between Convex lenses and Concave lenses
|Convex Lenses||Concave Lenses|
|This is known as a lens that converts light rays, and when they pass through these lenses, they tend to bend towards each other.||This is known as a diverging lens as a ray of light, when passing through this lens, tends to bend away from each other.|
|It tends to thicken in the center and its edges are relatively thin.||It tends to be thinner in the center and its edges are comparatively thicker.|
|It is also used for long-term vision correction.||It is used to correct shortsightedness.|
|Focal length is positive in nature.||Focal length is negative in nature.|
|Example: A camera||Example: A torchlight|
Some other type of Lenses
- [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 Center : – 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 center 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 center 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 center.
- [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 center 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.
3 Difference Between Real and Virtual Image
|Real Image||Virtual Image|
|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 depending 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 magnifying glasses. 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 magnifying glasses.
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 Scattering of Light
Definition: – White or multicolored 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, Types of light scattering 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 colored stripes. At the top of the strip are red, then orange, yellow, yellow, green, blue, dark blue, indigo, and purple, respectively. This multi-colored 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 colors, 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 colors. When you put this luminosity emitted from the prism on the screen, the wide stripe found by the light of those seven different colors 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 ‘ Benia, shakala ‘ 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-color 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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Thanks for Reading