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Students may download the complete chapter in PDF format. So, read the complete chapter thoroughly and do not ncert solutions class 10th light any topic. This chapter explains the concepts of reflection and refraction of light.

Some important topics to learn from this chapter ncert solutions class 10th light. Students must go through these detailed solutions to understand all the concepts clearly and manage their exam preparations in an efficient manner.

All our NCERT books and solutions are reviewed by the subject experts to bring the reliable and error free content for students. We understand ncert solutions class 10th light importance of a good study resource for students to boost their performance in exams and emerge as an achiever.

All the solutions have been prepared by the subject experts and are provided with detailed and appropriate explanation. Jagranjosh Education Awards Click here if you missed it! Read in hindi. Light- Reflection and Refraction. This website uses cookie or similar technologies, to enhance your browsing experience and provide personalised recommendations.

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The main topics included consist of spherical mirrors, magnification, reflection, refraction and power of a lens. To provide simplification, Light Reflection and Refraction Class 10 Solutions include various diagrams, logical problems and detailed content in simple words.

The topic Reflection of Light Class 10 refers to light waves bouncing off the surface of objects that do not have the capability of absorbing energy produced by radiation.

A surface of a pool, for example, will display clarity of surrounding objects when still. Whereas, all the rays would be scattered once a rock is thrown inside it preventing systematic reflection of light. Refraction of light Class 10, on the other hand, refers to the bending of light waves when it travels from a faster to a slower medium. Images formed by lenses and our eyes exist due to this process.

All the aforementioned topics are thoroughly explained under Chapter 10 Science Class 10 solutions by teachers having expertise in the subject. Physics subject requires students to have a good grip on the basic understanding of the concepts. The normal weightage of the part as indicated by the most recent guidelines is 7 marks.

In Ch 10 Science Class 10, students will get knowledge about refraction and reflection. One will find out about spherical mirrors, the formation of images and draw ray diagrams. Following are the topics covered under Chapter 10 Class 10 Science:. Ex Class 10th Science Chapter 10 offers great opportunities for students towards achieving maximum marks.

The main benefits of these solutions are:. The solutions created by them are exact and will help you in making sure that you secure good marks in the tests. The solutions to various questions in this chapter are clarified with charts and viable diagrams with regards to an easy understanding of students.

The solutions are designed and created keeping in mind one of the main objectives of helping students in obtaining high marks. The solutions are not very complicated and explain step-by-step processes thoroughly to help students have a strong understanding of the concepts. Case II: When the lower half of the lens Is covered In this case, a ray of light coming from the object is refracted by the upper half of the lens.

These rays meet at the other side of the lens to form the image of the given object, as shown in the given figure. Question 10 An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm.

Draw the ray diagram and find the position, size and the nature of the image formed. The negative value of image height indicates that the image formed is inverted. The position, size, and nature of image are shown alongside in the ray diagram.

Question 11 A concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens? Draw the ray diagram. Question 12 An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm.

Find the position and nature of the image. Thus, image is virtual, erect and diminished. What does this mean?

Question 14 An object 5. Find the position of the image, its nature and size. Question 15 An object of size 7. At what distance from the mirror should a screen be placed, so that a sharp focussed image can be obtained? Find the size and the nature of the image. The image is real, inverted and enlarged in size. Question 16 Find the focal length of a lens of power What type of lens is this? Find the focal length of the lens.

Is the prescribed lens diverging or converging? Reflection of light by curved surfaces; Images formed by spherical mirrors, center of curvature, principal axis, principal focus, focal length, mirror formula Derivation not required , magnification. Refraction; laws of refraction, refractive index.

Refraction of light by spherical lens; Image formed by spherical lenses; Lens formula Derivation not required ; Magnification. Power of a lens;.

Formulae Handbook for Class 10 Maths and Science. Question 1. Define the principal focus of a concave mirror? Answer: Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror.

This point is known as the principal focus of the concave mirror. Question 2. The radius of curvature of a spherical mirror is 20 cm. Question 3. Name the mirror that can give an erect and enlarged image of an object.

Answer: When an object is placed between the pole and the principal focus of a concave mirror, the image formed is virtual, erect, and enlarged. Question 4. Why do we prefer a convex mirror as a rear-view mirror in vehicles?

Answer: Convex mirrors give a virtual, erect, and diminished image of the objects placed in front of them. They are preferred as a rear-view mirror in vehicles because they give a wider field of view, which allows the driver to see most of the traffic behind him.

Find the focal length of a convex mirror whose radius of curvature is 32 cm. A concave mirror produces three times magnified enlarged real image of object placed at 10 cm in front of it. A ray of light travelling in air enters obliquely into water. Answer: The light ray bends towards the normal.

When a ray of light travels from an optically rarer medium to an optically denser medium, it gets bent towards the normal.

Since water is optically denser than air, a ray of light travelling from air into the water will bend towards the normal. Light enters from air to glass having refractive index 1. Answer: Refractive index of a medium nm is given by,. Find out, from Table, the medium having highest optical density. A medium which has the highest refractive index will have the highest optical density and vice-versa.

It can be observed from table Therefore, diamond has the highest optical density and air has the lowest optical density.

You are given kerosene, turpentine and water. Answer: The light can travel fast through water. Question 5. The refractive index of diamond is 2. This suggests that the speed of light in diamond will reduce by a factor 2. Define one dioptre of power of a lens?

Answer: One dioptre is the power Of a lens Of focal length 1m. Power of lens is defined as the reciprocal of its focal length. It is denoted by D. A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the lens if the image is equal to the size of the object? Also find the power of the lens. The position of image should be double the focal length. Hence, the object should be at 2f.

Find the power of a concave lens of focal length 2 m. Which one of the following materials cannot be used to make a lens? Where should an object b. A spherical mirror and a thin spherical lens have each a focal length of 15 cm. The mirror and the lens are likely to be: a both concave b both convex c the mirror is concave, but the lens is convex d the mirror is convex, but the lens is concave Answer: a Both concave.

No matter how far you stand from a mirror, your Image appears erect. The mirror is likely to be a plane b concave c convex d Either plane or convex Answer: d Either plane or convex. Question 6.

Question 7. We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. For getting an erect image using a concave mirror, the object should be placed at a distance less than the focal length. The image formed will be virtual, enlarged and erect. Question 8. Name the type of mirror used in the following situations. Answer: a Concave mirror, to get powerful and parallel beams of light. Question 9.

One half of a convex lens is covered with a black paper. Answer: Yes, even when one half of the lens is covered with a black paper, complete image of the object will be formed.

Take a convex lens and focus the light from a distant object onto a screen. As expected an image sharp is formed at a distance equal to the focal length Cover the lower or the upper half of the lens and focus the light from the same object onto the same screen. You will be able to get a sharp image again; however the brightness of the image will be less in the second case.

The same effect w,ll be seen even if the lens is half covered with black strips. Question An object 5cm in length is held 25cm away from a converging lens of focal length 10 cm. Draw a ray diagram and find the position, size and the nature of the image formed. It is real and inverted, and smaller in size than the object. How far is the object placed from the Pens? An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm.

Answer: This means that size of the image is equal to the size of the object. An object 5. Find the position of the image nature and size.

An object of size 7. At what distance from the mirror should a screen be placed, so that a sharp focused image can be obtained? Find the focal length of a lens of power Hold a highly polished steel spoon curved inwards close to your face and move it slowly away from your face.

What will you observe? When the spoon is at a small distance from the face such that, the object lies between pole and focus of concave mirror, so an enlarged and erect image of your face will be observed but as the spoon is slowly moved away from the face, the image becomes smaller and appears inverted.

No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be [NCERT] a plane b concave c convex d either plane or convex Answer: d Plane mirrors and convex mirrors always form the erect images. The image formed by a concave mirror is observed to be virtual, erect and larger than the object. An object AB is placed in front of a convex lens at its centre of curvature as shown in figure below.

Four students traced the path of light ray after refraction through the lens. Which one of them is correct? The image formed is real and inverted.

A spherical mirror and a thin spherical lens have each of a focal length cm. The mirror and lens are likely to be [NCERT] a both concave b both convex c mirror is concave and lens is convex d mirror is convex and lens is concave Answer: a The focal length is taken as negative for both concave mirror and concave lens. Which of the following can make a parallel beam of light when light from a point source is incident on it?

Under which of the following conditions, a concave mirror can form an image larger than the actual object? A light ray enters from medium A to medium Bas shown in the figure. So, it has greater refractive index and lesser velocity of light w. So, refractive index of medium B w. Figure shows a ray of light as it travels from medium A to medium B. Beams of light are incident through the holes A and B and emerge out of box through the holes C � and D respectively, as Box shown in the figure.

Which of the following could be inside the box? Therefore, a rectangular glass slab could be inside the box as the extent of bending of light ray at the opposite parallel faces AB air-glass interface and CD glass-air interface of the rectangular glass slab are equal and opposite. This is why the ray emerges parallel to the incident ray.

A beam of light is incident through the holes on side A and emerges out of the holes on the other face of the box as shown in the figure. So, inside the box there must be a convex lens. Which of the following statement is true? Magnification produced by a rear view mirror fitted in vehicles [NCERT Exemplar] a is less than one b is more than one c is equal to one d can be more than or less than one depending upon the position of the object in front of it.

Answer: a The convex mirror forms virtual, erect and diminished image of the object and rear view mirror also form same type of image.

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