Detail Page

published by the Exploratorium
This webpage contains an Exploratorium activity that shows how the perceived size of an object depends on its distance from the viewer. A materials list, procedure, a follow up, and images of the setup, are all provided.
Subjects Levels Resource Types
- Geometrical Optics
- High School
- Middle School
- Instructional Material
= Activity
- Reference Material
Intended Users Formats Ratings
- Learners
- text/html
- image/gif
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Access Rights:
Free access
© 2007 Exploratorium
eyesight, geometry, perception, perspective
Record Creator:
Metadata instance created August 3, 2007 by Andrew Coughlin
Record Updated:
August 2, 2016 by Lyle Barbato
Last Update
when Cataloged:
October 20, 1997
Other Collections:

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Record Link
AIP Format
(Exploratorium, San Francisco, 2007), WWW Document, (
Size and Distance, (Exploratorium, San Francisco, 2007), <>.
APA Format
Size and Distance. (1997, October 20). Retrieved December 18, 2018, from Exploratorium:
Chicago Format
Exploratorium. Size and Distance. San Francisco: Exploratorium, October 20, 1997. (accessed 18 December 2018).
MLA Format
Size and Distance. San Francisco: Exploratorium, 2007. 20 Oct. 1997. 18 Dec. 2018 <>.
BibTeX Export Format
@misc{ Title = {Size and Distance}, Publisher = {Exploratorium}, Volume = {2018}, Number = {18 December 2018}, Month = {October 20, 1997}, Year = {2007} }
Refer Export Format

%T Size and Distance
%D October 20, 1997
%I Exploratorium
%C San Francisco
%O text/html

EndNote Export Format

%0 Electronic Source
%D October 20, 1997
%T Size and Distance
%I Exploratorium
%V 2018
%N 18 December 2018
%8 October 20, 1997
%9 text/html

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Citation Source Information

The AIP Style presented is based on information from the AIP Style Manual.

The APA Style presented is based on information from APA Electronic References.

The Chicago Style presented is based on information from Examples of Chicago-Style Documentation.

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