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NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction - Free PDF

Light rays that are parallel to the principal axis of a concave mirror converge at a specific point on its principal axis solutionw reflecting from the mirror. This point is known as the principal focus of the concave mirror. Name the mirror that can give an erect and enlarged image of an object. We prefer a convex mirror as a rear-view mirror in vehicles because it gives a wider field of view, which ligyt the driver to see most of the traffic behind.

Convex mirrors always form a virtual, erect, and diminished image of the objects placed in front of it. A concave mirror produces three times magnified enlarged real image of object placed at 10 cm in front of it. Lighg is the ncert solutions class 10th light chapter model located? A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? The ray of light bends towards the normal.

When a ray of light enters from an optically rarer medium having low refractive index to an optically denser medium having high refractive indexits speed slows down and it bends towards the normal. Since water is optically denser than air, a ray of light entering from air into water will bend towards the normal. Light enters from air to glass having refractive index 1. What is the speed of light in the glass? The speed of light in vacuum is hcapter x 10 8 ms Find out, from Table, the medium having highest optical density.

Also find the medium with lowest optical density. A ncert solutions class 10th light chapter model 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. In which of these does the light travel fastest?

Use the information given in Table. In water light travel faster as compare to kerosene and turpentine because the refractive index of water is lower than that Ncert Solutions Class 10th Physics Chapter Light Model of kerosene and turpentine. The speed of light is inversely proportional to the refractive index.

The refractive index of diamond is 2. This means that the speed of light in diamond will reduce by a factor 10tu 2. The SI unit of power of lens is dioptre which is denoted by the letter 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 convex lens if the image is equal to the size of the object?

Also, find the power of the lens. It is given that the image of the ncert solutions class 10th light chapter model is solutikns at a distance of ncert solutions class 10th light chapter model cm from the convex lens. Hence, the needle is placed in front of the lens at a distance of 50 cm. Which one of the following materials cannot be used to make a lens? The image formed by a concave mirror is observed to be virtual, erect and larger than the object.

Where should be the position clxss the object? Where should an object be placed in front of a convex lens to get a real image of the size of the object? A spherical mirror and a thin spherical lens have each moxel focal length of cm.

No matter how far you stand from a mirror, your image appears erect. Which of the following lenses would you prefer to use while reading small letters ncert solutions class 10th light chapter model in a dictionary? We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror?

What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case. Name the type of mirror used in the following situations. One-half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object? Verify your answer experimentally.

Explain your observations. The convex lens ncert solutions class 10th light chapter model form complete image of an object, even if its one half is covered with black paper. It can be understood by the following two cases. Case I. When the upper half of the lens is Ncert Solutions For Class 10th Geography Chapter 5 Model covered Clas this case, a ray of light coming from the object will be refracted by the lower 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 above figure. When the lower half of the lens is covered In this case, solutione ray of light coming from the object is refracted by the upper half of the lens.

An object 5 cm in length is pight 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.

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. The negative value of u indicates that the object is placed 30 cm in front of the lens. This is shown in the following ray diagram. An object ncert solutions class 10th light chapter model placed at a distance of 10 cm from aconvex mirror of focal length 15 cm. Find the position and nature of the image.

The positive sign means image formed by a plane mirror is virtual and erect. Since the magnification is 1 it means that the size of the image is equal to the size of the object. An object 5 cm is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm.

Find the position, nature and size of the image. The positive value of image height indicates that the image formed is erect. Therefore, the image formed is virtual, erect, and smaller in 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 size and the nature of the image. Hence, it is a concave lens. Find the focal length of the lens. Is the prescribed lens diverging or converging? Hence, it is a convex lens or a converging lens.

Final:

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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.

Q2 :The radius of curvature of a spherical mirror is 20 cm. What is its focal length? Q3 :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.

Q4 :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.

Q5 :Find the focal length of a convex mirror whose radius of curvature is 32 cm. Q6 :A concave mirror produces three times magnified enlarged real image of object placed at 10 cm in front of it. Where is the image located? Q7 :Aray of light travelling in air enters obliquely into water.

Does the light ray bend towards the normal or away from the normal? 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.

Q8 :Light enters from air to glass having refractive index 1. What is the speed of light in the glass? The speed of light in vacuum is 3 x 10 8 m s Q9 :Find out, from Table, the medium having highest optical density. Also find the medium with lowest 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. Q10 :You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table.

The relation is given as It can be inferred from the relation that light will travel the slowest in the material which has the highest refractive index and travel the fastest in the material which has the lowest refractive index. Therefore, light travels the fastest in water. Q11 :The refractive index of diamond is 2. What is the meaning of this statement? This suggests that the speed of light in diamond will reduce by a factor 2.

Q12 :Define 1 dioptre of power of a lens. Answer : Power of lens is defined as the reciprocal of its focal length. If Pis the power of a lens of focal length Fin metres, then The S.

It is denoted by D. Q13 :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 convex lens if the image is equal to the size of the object? Also, find Ncert Solutions Class 10th Maths Chapter 7 Model the power of the lens. Answer : When an object is placed at the centre of curvature, 2F 1 , of a convex lens, its image is formed at the centre of curvature, 2F 2 , on the other side of the lens.

The image formed is inverted and of the same size as the object, as shown in the given figure. It Ncert Solutions Class 10th Light Chapter Number is given that the image of the needle is formed at a distance of 50 cm from the convex lens. Hence, the needle is placed in front of the lens at a distance of 50 cm. Q14 :Find the power of a concave lens of focal length 2 m.

Hence, the power of the given concave lens is Exercise : Solutions of Questions on Page Number : Q1 :Which one of the following materials cannot be used to make a lens? Since clay does not show such property, it cannot be used to make a lens.

Q2 :The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object? Answer : d When an object is placed between the pole and principal focus of a concave mirror, the image formed is virtual, erect, and larger than the object.

Q3 :Where should an object be placed in front of a convex lens to get a real image of the size of the object? Answer : b When an object is placed at the centre of curvature in front of a convex lens, its image is formed at the centre of curvature on the other side of the lens. The image formed is real, inverted, and of the same size as the object. Q4 :A spherical mirror and a thin spherical lens have each a focal length of cm.

The mirror and the lens are likely to be a both concave b both convex c the mirror is concave and the lens is convex d the mirror is convex, but the lens is concave Answer : a By convention, the focal length of a concave mirror and a concave lens are taken as negative.

Hence, both the spherical mirror and the thin spherical lens are concave in nature. Q5 :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 A convex mirror always gives a virtual and erect image of smaller size of the object placed in front of it. Similarly, a plane mirror will always give a virtual and erect image of same size as that of the object placed in front of it.

Therefore, the given mirror could be either plane or convex. Class 10 Science Chapter 10 solution Hindi mediums are created by our in-house experts keeping the understanding ability of all types of candidates in mind. NCERT textbooks and solutions are built to give a strong foundation to every concept.

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