Skills for Study Level 2 Teacher's Book - Cambridge University Press

Suggested answersSource of errorYou may not view the images of thepins perpendicularly downwardsThe container might not be completelyfull of waterYou might include the thickness ofthe mirror in your measurement of theapparent depthThe temperature of the water in eachbeaker may be differentSolutionWork with a partner who canmonitor whether the point of view isperpendicular.Take more than one reading.Ensure that it’s completely filled.Measure from the surface ofthe water, not the top surface ofthe mirror.Take the water from a commonsource. Use a thermometer ifpossible.dSuggested answersParallax error in taking the reading against the ruler (students should ensurethat their point of view is perpendicular to the position of the pin againstthe ruler).Most rulers have a short section at either end where there are no markings.Students should be careful not to accidentally include this in their readings.Note: Ask students to turn to the checklist on p.241 and reread the tips relating toUnit 2 Part A, before reading the tips to Unit 2 Part B. Encourage students to putthese tips into practice in their studies from now on. Tell them they will be asked toreport back on this in a future lesson.Unit 2 Part B ∙ Understanding written information 49