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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. Name the mirror that can give an erect oey enlarged image of an object. We himdi a convex mirror as a rear-view mirror in vehicles because it gives a wider field of view, which allows 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. Where is the sciece 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 ncert 10th science solution hindi medium key 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 mdeium 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 ncert 10th science solution hindi medium key in the glass? The speed of light in vacuum is ncert 10th science solution hindi medium key x 10 8 ms 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.

You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the ncert 10th science solution hindi medium key given in Table. In water light travel faster as compare to kerosene and turpentine because the refractive index of water is lower than that 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 of 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 bindi image of the needle is formed at a distance of 50 cm from mexium 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 of 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 a 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 found 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 ncert 10th science solution hindi medium key 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 hidni. One-half of a convex lens is covered with a black paper. Will this lens produce a complete ncery of the object? Verify your answer experimentally. Explain your observations.

The convex lens will 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 covered In this case, a ray of light coming from the object will be refracted by the lower ncert 10th science solution hindi medium key of the lens.

These rays meet at the other side meium 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, a ray of light coming from the object is refracted by the upper half of the lens.

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. 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 ncert 10th science solution hindi medium key the lens.

This is shown in the following ray diagram. An object is 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 mediym obtained?

Find ncert 10th science solution hindi medium key size and the ,edium 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.


Resistance: The resistance of a conductor is its property by virtue of which it opposes the flow of current through it. It does not become red when current flows through it. Why is the series arrangement not used for domestic circuits? You can be successful in your life by getting a quality education. Clearly, the direction of electronic current is from negative terminal to positive terminal.


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