A standard formula for measuring purchasing power compares the value of money across different time periods: Purchasing Power = (Cost of Basket in Current Year / Cost of Basket in Base Year ...
\(power \ of \ a \ lens \ (D) = \frac{1}{focal \ length \ (m)}\) A lens has a power of -3.33 dioptres. Calculate the focal length and state what type of lens it is.
Power is measured in watts (W), energy in joules (J) and time in seconds (s). 1 W = 1 J/s (1 watt is 1 joule per second.) Electrical power can be calculated using the equation.
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