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प्रश्न
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उत्तर
Linear magnification is defined as the ratio of the height of the image to the height of the object. It is taken to be positive for an image to be virtual and erect and negative when the image is real and inverted.
Magnification produced by a concave mirror is:
Magnification = height of image / height of object.
It is a pure ratio and does not have any units.
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संबंधित प्रश्न
Explain the following term related to spherical lenses:- principal focus
What type of image is formed:
in a plane mirror?
What kind of mirror is required for obtaining a virtual image of the same size as the object?
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?
How is a spherical mirror used to diverge a beam of light from a point? Name the type of mirror used.
State the kind of mirror used
(a) by a dentist, and
(b) as a street light reflector.
Draw a ray diagram in each of the following cases to show the formation of image, when the object is placed :
(i) between the optical centre and principal focus of a convex lens.
(ii) anywhere in front of a concave lens.
(iii) at 2F of a convex lens.
State the signs and values of magnifications in the above-mentioned cases (i) and (ii).
Is real image always inverted?
Define linear magnification produced by a mirror?
Numerical problem.
The radius of curvature of a spherical mirror is 25 cm. Find its focal length.
