A converging lens has a focal length of 5cm. Determine its power

Assessment: WAEC SSCE - Physics - 2003 (Objective) Subject: Physics

Question 1 Report

A converging lens has a focal length of 5cm. Determine its power
Answer Details
Power is defined as the reciprocal of the focal length of a lens, expressed in meters and denoted by the unit dioptre (D). To convert from centimeters to meters, we divide by 100. Thus, the power of the lens is: P = 1/f = 1/0.05m = 20 D Therefore, the answer is +20.0.
Read lesson note on Electromagnetic Waves: Types Of Radiation In Electromagnetic Spectrum (WAEC)
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