New York Department of Education has been phasing in computer-based assessments, rather than using bubble sheets and pencils. "There's a lot of frustration," Rockland BOCES spokesperson Scott ...

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