How do you find focal point of a concave lens.....
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If you wish to find the focal point of a concave lens, you could take it outside on a clear day. Allow the sunlight to pass through the lens and observe the pattern formed on a screen that is parallel to the axis and located at the center of the lens
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Focal length of concave mirror is always positive.
It will find by mirror formula
⏩1/f=1/v+1/u⏪
is the mirror equation, where f is focal length, u is the object distance measured from principal, and v is the image distance measured from principal. You have to use this equation with proper sign convention as stated in the question.
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