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प्रश्न
In the figure is shown a concave mirror. A is a point on the principal axis. If an object O is kept at A, image is formed on A itself. Copy the diagram. Draw the image in the diagram. Is the image real or virtual?
Measure the distance PA and write it in the diagram. What is the distance PA called?
Mark a point B on the principal axis, at which, if a point source of light is kept, the rays travel parallel to principal axis after reflection from M. What is point B called?
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उत्तर
As the object is placed at A and its image is also formed at A, so the object must be at the center of curvature (C).
PA is called the radius of curvature and on measuring PA = 4.8 cm. Point B marked on the principal axis is called the principal focus.
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संबंधित प्रश्न
What type of mirror is used to obtain a real image-of an object?
What is a real image?
Copy the figure and complete it, by drawing two rays to show the formation of the image of the object AB. State the size, position and nature of image formed.
A boy is standing in front of a plane mirror at a distance of 3 m from it.
(i) What is the distance between the boy and his image?
(ii) If the boy moves 1 m backward, find the distance between the image and the boy.
Show an incident ray AO and the normal ON a plan mirror. draw the reflected ray and then find the angle between the incident and reflected rays.
Complete the ray diagram to show the image observed by the eye after reflection in the following figure.
Define reflection.
Match the following:
| 1. | Vegetable oil | a. | Transparent |
| 2. | Glass | b. | Translucent |
| 3. | Wood | c. | Waterproof |
| 4. | Aluminum foil | d. | Opaque |
______ through which light can pass completely.
