Geometric Optics_21

Uses of Concave Mirror

Uses of Convex mirror

In this post, we will solve Numerical problems based on the Light chapter of class 8 science. Here, first we will go through the law of reflection & related formulas, and then attempt the numerical questions. Solution & answer is given for all the numerical questions. Formulas Used 1 ] According to the law of […]

The image below shows the wavelengths of 7 colors of VIBGYOR in nanometers. Colour Wavelength in nanometer Violet [v] 400-440 Indigo [I] 440-460 Blue [B] 460-500 Green [G] 500-570 Yellow [Y] 570-590 Orange [O] 590-620 Red [Red] 620-700 Wavelengths of 7 colors of VIBGYOR Violet has the shortest wavelength. Red color has the longest wavelength.

Q] State using a neat diagram, what happens to the path of lighti. when light ray passes from rarer to denser medium.ii. when light ray passes from denser to rarer medium.iii. when light ray is incident normally at the boundary between two media. Answer: i. When a light ray passes from a rarer medium to […]

In this post, we will define the Magnification produced by Lenses, and then see the formulas used to find the magnification. There are 2 ways to define and formulate the term “Magnification by Lenses”. We will study both sets here in this post. Magnification produced by Lenses [based on image and object size] We will […]

Lens Formula – A formula that gives the relationship between image distance (v), object distance (u), and focal length (f ) of a lens is known as the lens formula. This lens formula applies to both types of spherical lenses: convex lenses as well as concave lenses. Lens Formula | spherical Lens equation The lens […]

Here we will present the New Cartesian Sign Convention for spherical lenses for measuring various distances in the ray diagrams of spherical lenses (convex lenses and concave lenses). Sign convention for spherical lenses According to the New Cartesian Sign, the sign Convention for spherical lenses goes like the following:(i) All the distances are measured from […]

This post presents a set of Lens numericals for class 10 with questions and answers. We will solve these Lens numerical problems with the help of lens sign convention and the lens formula. Also, Read and revise: Sign convention of lens Read here: Lens formula Lens numericals class 10 – solved Question 1] An electric […]

Here, in this post, we listed 2 rules for the formation of images by Concave Lens. After studying these, it will be easier to study the image formation by concave lenses, and related ray diagrams. Rules for the formation of images by Concave Lens The position of the image formed by a concave lens can […]

Here, in this post, we listed 3 rules for the formation of images by Convex Lens. After studying these, it will be easier to study the image formation by convex lenses, and related ray diagrams. Rules for the formation of images by Convex Lens (i) A ray of light coming parallel to the principal axis, […]

A lens that is thin in the middle and thick at the edges is called a concave lens. The most common form of a concave lens has both surfaces depressed inward in the middle. Three types of concave lenses are listed and then shown in the figure below. 3 Types of concave lens class 10 […]

A lens that is thick at the center and thin at the edges is called a convex lens. The most common form of a convex lens has both surfaces bulging out in the middle. Three types of convex lenses are listed and then shown in the figure below. 3 Types of convex lens class 10 […]

Optical fibres are used in medical endoscopes to see inside the body, and in communications to carry light signals. These fibres take the help of Total Internal Reflection of light to operate. Now, let’s see how Total Internal Reflection happens in Optical fibres. How Total Internal Reflection happens in Optical fibres The light ray is […]

Diamonds sparkle when white light is directed at them – the optical phenomenon behind this is Total internal reflection of light rays. Let’s discuss this in details. Diamonds sparkle when white light is directed at them – why and how? When white light enters a diamond, it is split into the colours of the spectrum. […]

Here in this post, you will get Ray Diagrams for Images formed by convex & concave lenses as a Quick Reference.Image formation by lenses is an interesting topic in the Light chapter. Here along with the ray diagram, you will get the related details like Object position, image position, and nature of the image. Ray […]

This post will cover why the angle of deviation is different for different colours. We will also see how the deviation angle, refraction angle, and refractive index are interrelated and all these again depend on the speed of light rays of different colours. The angle of deviation is different for different colours – explanations Light […]

Here we will discuss why violet is at the bottommost position of the spectrum made by the light emerging out of the prism on a white screen. This post is all about the position of violet color in the spectrum band created by the dispersion of light by a prism. Why is violet at the […]

Total Internal Reflection and Reflection are two different phenomena related to Light. Here we will talk about the difference between Reflection and Total Internal Reflection of light. Difference between Reflection and Total Internal Reflection of light 1] For Total Internal Reflection to happen the light ray has to pass from an optically denser medium to […]

Critical Angle for the diamond-air interface The Critical Angle for the diamond-air interface is 24 degrees. This means if the ray of light in the diamond medium strikes the separating surface between the diamond and air making an angle more than 24 degrees with the normal to the point of incidence then that ray of […]

The Critical Angle for the glass-air interface is 42 degrees. This means if the ray of light in the glass medium strikes the separating surface between glass and air making an angle more than 42 degrees with the normal to the point of incidence then that ray of light will undergo a total internal reflection […]

List of Tutorials on Light chapter (class 9 and 10 Physics) with content headers. Click the links and read the posts/topics to learn more. List of Tutorials on Light (class 9 and 10 Physics) Refraction of Light | Definition | Facts – definition of refraction, understand the concept of bending due to change of speed […]

Snell’s Law comes into action in the case of refraction of light, which is the change in direction of a light ray as it goes from one medium to another. As shown in Figure, a ray of light that encounters a change in medium is partially reflected, as if the boundary were a mirror. The […]

In this post, we will just talk about some special features of prism that make it a suitable medium to test the refraction of light. Subtopics discussed: Glass Prism as a refracting medium – features, and angle of prism Glass Prism – features of prism that contribute refraction through it To discuss the features we […]