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प्रश्न
When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.
What is the nature of spherical mirror?
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उत्तर
The spherical mirror is concave.
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संबंधित प्रश्न
Define the following term in the context of spherical mirrors:- Principal focus
When a spherical mirror is held towards the sun and its sharp image is formed on a piece of a carbon paper for some time, a hole is burnt in the carbon paper.
What is the advantage of using a carbon paper rather than a white paper?
Write the mirror formula. Give the meaning of each symbol which occurs in it.
The shiny outer surface of a hollow sphere of aluminium of radius 50 cm is to be used as a mirror:
Which type of spherical mirror will it provide?
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Discuss the position and nature of image formed by a concave mirror when an object is moved from infinity towards the pole of mirror.
Why does a driver use a convex mirror instead of a plane mirror as a rear view mirror?
Illustrate your answer with the help of a ray diagram.
At what distance from a concave mirror of focal length 25 cm should an object be placed so that the size of image is equal to the size of the object.
An object of height 2 cm is placed at a distance of 20 cm in front of a concave mirror of a focal length of 12 cm. Find the position, size, and nature of the image.
What do you understand by the term real image?
The boxes in figure (a, b, c) represent mirrors; insert a mirror which will reflect the incident ray as shown in the diagram.

Define the term Pole.
The minimum length of the mirror required to see the full image of the person is half ‘ of his height.
The distance from the center of curvature of the mirror to the pole is called the focal length of the mirror.
Define the radius of curvature.
A converging lens of focal length f is placed at a distance 0.3 m from an object to produce an image on a screen 0.9 m from the lens. With the object and the screen in the same positions, an image of the object could also be produced on the screen by placing a converging lens of focal length.
Visit a nearby hospital. You can also visit the clinic of an ENT specialist, or a dentist. Request the doctor to show you the mirrors used for examining ear, nose, throat and teeth. Can you recognise the kind of mirror used in these instruments?
