In a concave mirror, an object is placed at a distance x from the focus and the image is formed at a distance y from the focus. What is the focal length of the mirror? |
$(xy)^{\frac{1}{2}}$ $\frac{(x+y)}{2}$ $xy^{-1}$ $xy$ |
$(xy)^{\frac{1}{2}}$ |
From Newtons mirror formula $ f = \sqrt{xy}$ |