list out the material required to find of focal length of the concave mirror write the procedure and suggested the table to record the observation of the experiment
Answers
To determine focal length of a given concave mirror
Materials Required
A concave mirror
A measuring scale
A screen holder
A mirror holder
A mirror stand
Procedure
The distance between the selected distinct object should be more than 50 ft.
The concave mirror placed on the mirror stand and the distant object should be facing each other.
The screen should be placed in front of the reflecting surface of the mirror. To obtain a clear, sharp image the screen should be adjusted.
Using a metre scale the distance between the concave mirror and screen can be determined. The distance is the same as the focal length of the given concave mirror.
Repeat the above procedure thrice to calculate the average focal length.
Experimental Setup
determination of focal length of a thin concave mirror
Observation Table
Sl.no Position of concave mirror (M) Position of screen (S) Focal length = (M-S)
cm
1 60 cm 50 cm 10 cm
2 60 cm 50 cm 10 cm
3 60 cm 50 cm 10 cm
Calculation
Following is the mean value of the focal length of concave mirror:
\(\frac{f_{1}+f_{2}+f_{3}}{3}\;cm=10\;cm\)
Result
10 cm is the focal length of the concave mirror.
Precautions
To get a well illuminated and distinct image of the distinct object, the distant object should be well illuminated.
A concave mirror should be always placed near an open window.
The polished surface of the concave mirror and the distinct object should be facing each other.
There should not be any hurdle between the rays of light from the object and the concave mirror.
The screen and the concave mirror stand should be parallel to the measuring scale.
The mirror holder along with the mirror should be perpendicular to the measuring scale.
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