E-STAR - Student

Severity: Warning

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Filename: drivers/Session_files_driver.php

Line Number: 137

Backtrace:

File: /home/estarbk/public_html/dev.estar-bk.com/application/controllers/Main.php
Line: 8
Function: __construct

File: /home/estarbk/public_html/dev.estar-bk.com/index.php
Line: 315
Function: require_once

Severity: Warning

Message: session_start(): Failed to initialize storage module: user (path: /var/cpanel/php/sessions/alt-php74)

Filename: Session/Session.php

Line Number: 137

Backtrace:

File: /home/estarbk/public_html/dev.estar-bk.com/application/controllers/Main.php
Line: 8
Function: __construct

File: /home/estarbk/public_html/dev.estar-bk.com/index.php
Line: 315
Function: require_once

The mirror equation is used to determine the nature, position and size of the image formed by spherical mirrors. The derivation of mirror equation:

Since the two triangles are similar:

Since the two yellow triangles are similar:

Combining these two equations we have

Rearranging gives

Where f is the focal length of the mirror, d_o is the distance of the object from the mirror and d_i is the distance of the image from the mirror.

Magnification (m) is defined as the ratio of the image height to object height.