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# Xam Idea Class 10 Science Chapter 10 Solutions: Light-Reflection And Refraction

Xam Idea Class 10 Science Solutions for Chapter 10 – Light: Reflection and Refraction will be the perfect study resource for you in exam days. All the solutions are made with the objective to help you score high marks and boost up your confidence in Science subject. All the questions and solutions are outlined in a straightforward way for your better understanding of the chapter. The solutions will help you recognise and recapitulate the chapter quickly. All our Xam Idea Class 10 Science Solutions for Chapter 10 – Light: Reflection and Refraction are very helpful for the revision of the chapter.

Our Xam Idea Class 10 Science Solutions for Chapter 10 – Light: Reflection and Refraction cover all the prime and principal topics of the chapter. This includes the concept of light, nature of light, real image, virtual image, concave mirror, convex mirror, laws of light, concave lens, the convex lens, image formation by different lenses and mirrors, refractive index and power of the lens. You will learn about the type of images formed by spherical mirrors and lenses.

All the solutions for Xam Idea Class 10 Science Chapter 10 – Light: Reflection and Refraction are formulated as per the latest guidelines advised by CBSE and NCERT. The exercise section is divided into 5 parts which include miscellaneous questions. There are very short answer type questions, short answer type questions, long answer type questions, HOTS or higher-order thinking skills and value-based questions given in the exercises of the chapter.

## Important Topics for  Xam Idea Class 10 Science Solutions for Chapter 10 – Light: Reflection and Refraction

The chapter elaborates with defining light and its nature in different situations. It also includes topics like a reflection of light, spherical mirrors, image formation by spherical mirrors (concave and convex mirrors), sign convention of spherical mirrors, mirror formula and magnification, refraction of light, refraction through a rectangular glass slab, image formation by lenses(concave and convex lens) and their ray diagrams, refractive index, sign convention for spherical lenses, Lens formula and magnification, power of the lens.

The chapter also covers laws of reflection and refraction, applications of a concave and convex mirror, some important terms such as the centre of curvature, optical centre, principal axis, focus, focal length and a huge number of numerical based on these concepts.

Introduction

• Light is a form of energy that enables us to see objects. We can only see when the light from the objects reflects into our eyes.
• The objects which emit their own light are called luminous objects whereas the objects which do not emit their own light are called non- luminous objects.
• Light has a dual nature. It exhibits the property of both waves and particles in different conditions.
•  The picture which can be gotten on a screen is known as a genuine picture. Ex- Image obtained on a cinema screen is a real image.
•   The picture which can not be gotten on a screen is known as a virtual picture. A virtual image can be seen only by looking into a mirror or lens. The virtual image is just an illusion.
• The mirrors are classified into two types that are a plane mirror and spherical mirrors
• Spherical mirrors are also divided into two parts that are concave mirrors and convex mirrors.
• The image formed by a plane mirror is virtual, erect, the same size of the object, laterally inverted and formed at the same distance behind the mirror.
• Plane mirrors are fixed inside the walls of shops to make them bigger and they are also used as dressing tables mirrors.
•  A round mirror whose reflecting surface is bent inwards is known as a sunken mirror though a mirror whose reflecting surface is bent outwards is called a curved mirror.

Reflection of Light (Concave and Convex Mirrors)

• The way toward sending back the light beams which fall on the outside of an item is called the impression of light.
• Silver metals are probably the best reflector of light.
• There are two laws of reflection of light. The first one is the incident ray, reflected ray and the normal ray lie in the same plane.
• The point of reflection is consistently equivalent to the edge of frequency.
• The focal point of the reflecting surface of a circular mirror is a point which is known as the post.  It lies on the surface of the mirror.
• The reflecting surface of a spherical mirror forms a part of the sphere and this sphere has a centre. The point is called the centre of curvature of the spherical mirror and it is not a part of the mirror.
• The span of which the reflecting surface of a round mirror frames a section is known as the range of shape of the mirror.
• A nonexistent line going through the shaft and focal point of ebb and flow of a circular mirror are known as the central hub.
• Concave mirrors are used as shaving mirrors, reflectors in torches to get the powerful beam of light whereas convex mirrors are used as rearview mirrors.

Refraction of Light

• The change of direction of light when it passes from one medium to another is called the refraction of light or the bending of light when it goes from one medium to another is called refraction of light.
• The refraction of light occurs due to change in the speed of light going from one medium to another.
•  At the point when a beam of light goes from denser medium to rarer medium, it twists towards the ordinary.
• When a ray of light passes through a denser medium to a rarer medium it bends away from the normal.
• All the laws of refraction are the same as the laws of reflection except the last one which is the ratio of the sine of the angle of incidence to the sine of the edge of refraction is steady for a given pair of media.  This is also known as Snell’s law.
• The constant is called the refractive index. The refractive index can also be written as the ratio of speeds of light in the two media.
• If the first medium is air then the refractive index of that medium is known as an absolute refractive index.
• The focal length is always positive for the convex lens and always negative for concave lens and the rest of the sign convention is the same.
• Power of lens is defined as I upon the focal length.
• The intensity of a focal point is estimated in diopters.

### Exercise Discussion of Xam Idea Class 10 Science Solutions Chapter 10 Light Reflection And Refraction

There are a total of 57 questions in this specified section and each question carries 1 mark. The definition of light, ray or beam of light and other terms like principal axis, optical centre, the centre of curvature or focal length is a few questions in this exercise set.  The communication device which uses light for its working, what type of image is formed by a cinema screen, different uses of a concave and convex mirror, which mirror has a larger field of view etc. are some examples of questions that are discussed under this section.

This section comprises 30 questions and each question carries 3 marks. This section includes questions like name the phenomenon that can occur with the help of light, list four characteristics of the images formed of a plane mirror, what is a lateral inversion, what will happen if a ray falls normally on the surface etc. This section also covers the important and crucial numerical of the chapter.

This section contains 7 questions in all and each question carries 5 marks. Draw the ray diagrams of the convex and concave mirror, define the terms pole, focal length, radius curvature in detail, what should be the range of distance of an object placed in front of the mirror are some examples of the questions that are discussed in this section. Many numerical are also a part of this section.

HOTS (Higher-Order Thinking Skills)

There are a total of 17 questions in this section. All the questions are important from the exam point of view. Optically denser material out of glass or water, whether a converging lens is a diverging lens in any condition when convex mirror behaves like a plane mirror, why does a concave mirror have a real principal focus are some examples of the questions that are discussed under this particular section.

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• Xam Idea Solutions for Chapter 10 – Light: Reflection and Refraction are carefully designed in an error-free manner by our team.
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