Oakland and New York campaigns for $30 minimum wage gain steam as workers battle high costs and pushback Mark Dorsey, a lifelong East Oakland resident, works two jobs to make ends meet. The ...

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