\(power \ of \ a \ lens \ (D) = \frac{1}{focal \ length \ (m)}\) A lens has a power of -3.33 dioptres. Calculate the focal length and state what type of lens it is.

A single-element plano-convex lens is placed above each sample ... a stretch due to the image meeting the camera plane obliquely and (2) a small variation in magnification as a function of the ...