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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
Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.
Explain the following term:
Angle of reflection. Draw diagram/diagrams to show them.
Compare the characteristics of an image formed by a convex mirror and a concave mirror, when object is beyond center of curvature, but not at infinity.
An object OA is placed on the principal axis of a concave mirror as shown in the figure. Copy and complete the diagram to show the formation of image.
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.
Part of the eye which controls the light entering is called
The light falling on the mirror is called as ______ and the light reflected is called reflected ray.
