In an experiment, the focal length of a convex lens was measured(in cm) five times producing the following results: 21.1,21.2,21.7,28.8 and 21.3 What will the relative and percentage error in the focal length? Pls help imnot getting the ans.. Share with your friends Share 1 Rajnish Kumar answered this Dear student true value am =a1+a2+a3+a4+a55=21.1+21.2+21.7+28.8+21.35=22.82now mean absoulate error =∆a =∆a1+∆a2+∆a3+∆a4+∆a55=> 22.82-21.1+22.82-21.2+22.82-21.7+22.82-28.8+22.82-21.35=> 1.72+1.62+1.12+5.98+1.525=2.392relative error =∆a am=2.39222.82=0.104and % error =10.4%Regards 1 View Full Answer