Given: Object distance, u = -45 cm
Image distance, v = +90 cm (real)
Height of the object, = 2 cm
We need to calculate the Focal length
Applying the lens formula which is given as:
Since, focal length is positive, so the lens is convex lens.
Magnification is given by the following relation;
Also, the magnification is given by the ratio of height of image to the height of object.
The negative sign shows that the image is inverted.
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