Rev. Notes > IGCSE > Length and time Previous Topic Length and time Next Topic Topics
 Physical quantities Conversion of units Length Length-Measurement Micrometer Micrometer - Pitch Micrometer - Least count Micrometer - Zero error Micrometer - Data Table Time Multiples / submultiples of time Stop-clock Standard form Parallalax error Simple pendulum Amplitude of simple pendulum Time period of simple pendulum Frequency of simple pendulum

## Parallalax error

Whenever using a metre ruler or anyother similar instrument for measurement a common experimental error, called parallas error, should be avoided.

Parallax error occurs because the markings of the scale is not physically touching the object ( there exist some distance between markings and object ) and the marking is not viewed directly from above.

This will bring about relative movement between the object and markings on the scale when an observer’s eye is moved from side to side.

Parallax error exists at  position(b), but not at position (a).
Reading taken from position (b) = 4.8cm
Reading taken from postion(a) = 5.0cm

 Add Comment | FAQs | Report Error | | |

View Comments on this Chapter - Total Comments (12)

 Sarika Said : out put is given in the book which u have copied.so it was not useful. 06/05/17 06:20 AM

 yo mama Said : well it is informative but out of date but otherwise helpful 30/03/16 09:56 PM

 Edward Said : Very good helped me so much!!! 14/03/15 02:30 PM

 Cara Delivingne Said : This website is very helpful. However, there are still a few changes you can make to it, now that the syllabus has completely been modified. Thank you for your notes though! Xx 11/12/14 08:34 PM

 zuhi Said : where are the SI units,symbols,Prefixes,and diagrams ? 27/09/14 09:05 AM

 ghost Said : bluffmaster u will find past papers at www.xtremepapers.com 22/09/14 11:12 AM

 Daisy Said : I like ur comment Muffin :) 15/02/14 12:05 PM

 Bluffmaster Said : Good informative. But no past papers, no experiments. This is not IGCSE! You should improve this site. 15/02/14 12:04 PM

 bituu darak Said : Good information try to give all round info for vernier calliper and other important Info 05/09/13 11:29 AM

 Muffin Said : This is a very nice website and no one should be saying anything about it and ppl who do say bad things they are dummasses 16/07/13 11:50 AM

 whatever Said : you are wierd dumbass 08/05/12 10:46 PM

 shaheer salim Said : there s a mistake its 1cm(square) = 100 mm(square) 01/03/12 01:04 AM

# About us:

A team of committed professionals providing online resources of physics for the learners of IGCSE/AS/ A Level .....