Ramesh has a concave mirror,he wants to known the types of images formed by it .but he did not know it's focal length ho can he find focal length write the procedure and apparatus for it
Answers
What is the relation between magnification and focal length? Magnification is the ratio of the size of the image to the size of the real object. ... For objects well in front of the lens the lens to image distance will be a little larger than the focal length
As performed in the lab
Material Required -
A concave mirror, a mirror holder, a white screen fixed on a stand or a white wall, an object (candle) and a metre scale.
Procedure -
1.Fix concave mirror to mirror holder and place it on table.Turn the face of mirror towards a distant object (a candle in this case). The selected object should be visible with your naked eyes.
2.Adjust the position of the screen in such a way that it forms a clear image of the candle on the screen.
3.Measure the distance between the concave mirror and the screen with a metre scale. Record your observations in observation table.
4.Repeat the experiment two or three times and find the mean value of the focal length.
5.As performed in the simulator
Drag the screen by clicking on point A of the screen till you get a sharp image of the object.
6.Measure the distance between the concave mirror and the screen with given metre scale. This measured distance is focal length of concave mirror.
7.Repeat the process two or three times. Take the mean of the measured focal length.
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