Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; plgContentJComments has a deprecated constructor in /var/www/astarmathsandphysics/plugins/content/jcomments/jcomments.php on line 25 Call Stack: 0.0001 362560 1. {main}() /var/www/astarmathsandphysics/index.php:0 0.0603 1212000 2. Joomla\CMS\Application\SiteApplication->execute() /var/www/astarmathsandphysics/index.php:49 0.0603 1212000 3. Joomla\CMS\Application\SiteApplication->doExecute() /var/www/astarmathsandphysics/libraries/src/Application/CMSApplication.php:267 0.3009 4105672 4. Joomla\CMS\Application\SiteApplication->dispatch() /var/www/astarmathsandphysics/libraries/src/Application/SiteApplication.php:233 0.3025 4133384 5. Joomla\CMS\Component\ComponentHelper::renderComponent() /var/www/astarmathsandphysics/libraries/src/Application/SiteApplication.php:194 0.3036 4151096 6. Joomla\CMS\Component\ComponentHelper::executeComponent() /var/www/astarmathsandphysics/libraries/src/Component/ComponentHelper.php:356 0.3036 4168104 7. require_once('/var/www/astarmathsandphysics/components/com_content/content.php') /var/www/astarmathsandphysics/libraries/src/Component/ComponentHelper.php:381 0.3046 4175840 8. ContentController->execute() /var/www/astarmathsandphysics/components/com_content/content.php:42 0.3046 4175840 9. ContentController->display() /var/www/astarmathsandphysics/libraries/src/MVC/Controller/BaseController.php:710 0.3608 4403496 10. ContentController->display() /var/www/astarmathsandphysics/components/com_content/controller.php:113 0.3626 4420896 11. Joomla\CMS\Cache\Controller\ViewController->get() /var/www/astarmathsandphysics/libraries/src/MVC/Controller/BaseController.php:663 0.3633 4441824 12. ContentViewArticle->display() /var/www/astarmathsandphysics/libraries/src/Cache/Controller/ViewController.php:102 0.3739 4507136 13. Joomla\CMS\Plugin\PluginHelper::importPlugin() /var/www/astarmathsandphysics/components/com_content/views/article/view.html.php:189 0.3740 4507392 14. Joomla\CMS\Plugin\PluginHelper::import() /var/www/astarmathsandphysics/libraries/src/Plugin/PluginHelper.php:182

The Formation of Images By a Plane Mirror

If an object A is placed in front of a plane mirror, an image A' will be formed.

The image will be

  • The same distance behind the mirror as the object is in front.

  • Virtual – the rays that form the image will only appear to come from the object. In fact the 'virtual rays' are traced back to the image.

  • Upright.

  • The same size as the object.

  • Laterally inverted – left and right are interchanged. In the diagram the man is shaving with his right hand, but in the mirror he appears to be shaving with his left.