Physics, asked by VictorTheGreat7563, 1 year ago

to determine the focal length of a convex lens by u-v method

Answers

Answered by ahmad60
3
The equation connecting the distance between mirror and object (u), distance between mirror and image (v), and the focal length of the mirror (f) is called mirror formula.

                                                             

Or ; The focal length of the concave mirror,

                                                             

 

Focal length by graphical method

From u-v graph :

We can measure the focal length of the given concave mirror graphically by plotting graph between u and v. For this, plot a graph with u along X axis and v along Y axis by taking same scale for drawing the X and Y axes. A curve is obtained. The point at which the bisector meets the curve gives the radius of curvature (R).

Now focal length can be calculated from the relation, R = 2f.

From 1/u – 1/v graph :

We can also measure the focal length by plotting graph between 1/-u and 1/v. Plot a graph with 1/u along X axis and 1/v along Y axis by taking same scale for drawing the X and Y axes. The graph is a straight line intercepting the axes at A and B. 

The focal length can be calculated by using the relations, OA=OB= 1/f.


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