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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 Ncert Solutions Class 10th Hindi Medium Video 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. Therefore, magnification m produced Ncert Solutions For Class 10th Science In Hindi Medium Now by a rear view mirror fitted in vehicles is less than one, i.
Rays from the Sun converge at a point 15 cm in front of a concave mirror. Where should an object be placed, so that size of its image is equal to the size of the object? Therefore, focal length if of concave mirror is 15 cm. This is why the ray emerges are parallel to the incident ray.
You are given water, mustard oil, glycerine and kerosene. In which of these media, a ray of light incident obliquely at same angle would bend the most?
Thus, glycerine is most optically denser and hence have the largest refractive index. Therefore, ray of light bend most in glycerine. How many images will be observed by him? Where should an object be placed in front of a convex lens to get a real image of the size of the object? Which of the following lenses would you prefer to use while reading small letters found in dictionary? For better performance its focal length should be small. Light EM waves wave-length nm to nm.
The path of light always travel in straight line is ray of light. Law of Refraction Refraction of light: Bending of light ray while passing from one medium to another medium. Reflection of light: Turning back of light in the same medium after striking the reflecting surface or mirror. The incident ray the normal and the reflected ray all lie in the same plane The angle of incidence i is always equal to angle of reflection r i.
Concave Mirror Spherical glass polished on the outside. It is also known as a converging mirror. Convex Mirror Spherical glass polished inside. It is also known as diverging mirror. Lens Piece of transparent material with two refracting surfaces, at least one is curved and refractive index should different as that of the surrounding. Concave Lens Cental portion of lens is thinner than marginal.
It as also known as diverging lens. Convex Lens Central portion of lens is thicker than marginal. It is also known us converging lens. Magnification Ratio of distance of image to the distance of object from the optical centre.
Nature, position and relative size of the image formed by a concave lens for various position of the object. Nature, position and relative size of the image formed by a convex lens for various positions of the object. If you have any questions related to this article, kindly ask your questions through the comment section below and we will get back to you as soon as possible. Answer: We prefer a convex mirror as a rear-view mirror in vehicles because of two reasons : A convex mirror always produces an erect image of the objects.
The image formed in a convex mirror is highly diminished or much smaller than the object, due to which a convex mirror gives a wide field of view of the traffic behind. A convex mirror enables the driver to view such larger area of the traffic behind him.
Page Number: Question 1 Find the focal length of a convex mirror whose radius of curvature is 32 cm. Page Number: Question 1 A ray of light travelling in air enters obliquely into water. Page Number: Question 1 Define 1 dioptre of power of a lens. Answer: a Both concave Question 5 No matter how far you stand from mirror, your image appears erect.
A convex mirror has a wider field of view than a plane mirror of the same size. NCERT Solutions for Class 10 Science Chapter 10 Light Reflection and Refraction 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. Page Question 1. Page: Question 1. Answer: Refractive index of a medium nm is given by, Question 3.
Therefore, diamond has the highest optical density and air has the lowest optical density Question 4. Answer: Question 1. Answer: Question Speed of light depends on the medium Light shows behaviour such as reflection, refraction, interference, diffraction, polarisation etc. Diffuse Reflection Reflection on rough surface. Every story has some emotion or some lesson. For scoring good marks in your CBSE Class 10 exams, you must demonstrate your conceptual clarity and understanding of Ncert Solutions Class 10th Hindi Medium With the topics by correctly answering the questions.
Your Class 10 Ncert Solutions For Class 10th Science In Hindi Medium Key Hindi syllabus is divided into different parts. The chapters cover engaging stories and poems based on real-life situations, historical events and more. Are you afraid of Hindi lessons?
Hindi is one of those language subjects which can give you a tough time if you are not a native speaker. These chapter solutions will be useful while studying the chapters from your Hindi syllabus. As a student, you may need help while completing your homework or to prepare for the exams. Class 10 is one of those years when every subject, whether a favorite of yours or not, should be given equal attention. For scoring marks in Hindi, your writing skills should be excellent. Of course, you need to know what to write, but it is also important to understand how to write the answers.
While learning Hindi, you may study all the chapters, but writing practice will strengthen your command over the language. Enter the OTP sent to your number Change. Resend OTP. Don't miss this! Ok Cancel. Ok Choose Chapter. Ok Choose Topic. Yes No. Choose Subjects. Choose Chapters. Kshitij Bhag 2 Sparsh Bhag - 2 Sanchyan Bhag -2
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