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| Focal length of a concave mirror |
Focal length
To
determine the focal length of a concave mirror by obtaining an image of a far
distance object
AIM :- To
determine the focal length of a concave mirror by obtaining an image of a far
distance object.
APPARATUS
:- A concave mirror of diameter
approximately 10 cm., stand, screen, foot-rule, etc.
PRINCIPLE
:- Rays coming from a far distance object are almost parallel. Such
rays, parallel to the principal axis, after being reflected by a concave
mirror, are focused at the principal focus of the mirror. Distance between the
principal focus and the pole of the mirror is known as the focal length.
NOTE
: Here screen should be taken
small, so that rays coming from the object are not
blocked by the screen itself. Diameter of the screen here can be approximately 3 – 4 cm.
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| Focal length of Concave mirror |
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| Focal length of Concave mirror, |
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| Focal length of concave mirror Adjustment |
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| Focal Length of Concave mirror |
Distance between the pole of the mirror and the
image on the
screen = focal-length = CM.
CONCLUSION
PRACTICAL USES
Concave mirrors are used in head lights of
vehicles, solar furnace, solar cooker, shaving mrror, etc. For all such
applcatons it is necessary to know the focal length of the mirror to used. It
can be estimated using the given method.
For more details view Video.
For more details view Video.
Focal length
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