## the image formed on a screen by a concave mirror of radius 20 cm is 3 times the size of the object. what is the distance of the screen from

Question

the image formed on a screen by a concave mirror of radius 20 cm is 3 times the size of the object. what is the distance of the screen from the mirror?​

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3 years 2021-08-19T09:06:22+00:00 1 Answers 0 views 0

1. Given that,

Radius of mirror = 20 cm

Size of image = 3 times of size of object

We need to calculate the distance of the screen from the mirror

Using formula of magnification

*** QuickLaTeX cannot compile formula:
m=-\dfrac{h'}{h}=\dfrac{v}{u}

*** Error message:
Cannot connect to QuickLaTeX server: cURL error 28: Operation timed out after 40004 milliseconds with 0 out of -1 bytes received
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*** QuickLaTeX cannot compile formula:
-\dfrac{h'}{h}=\dfrac{v}{u}

*** Error message:
Please make sure your server/PHP settings allow HTTP requests to external resources ("allow_url_fopen", etc.)
These links might help in finding solution:
http://wordpress.org/extend/plugins/core-control/
http://wordpress.org/support/topic/an-unexpected-http-error-occurred-during-the-api-request-on-wordpress-3?replies=37

Where, h’ = size of image

h = size of object

v = image distance from mirror

u = object distance from mirror

Put the value into the formula

*** QuickLaTeX cannot compile formula:
-\dfrac{3h}{h}=\dfrac{-v}{u}

*** Error message:
Cannot connect to QuickLaTeX server: cURL error 52: Empty reply from server
Please make sure your server/PHP settings allow HTTP requests to external resources ("allow_url_fopen", etc.)
These links might help in finding solution:
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http://wordpress.org/support/topic/an-unexpected-http-error-occurred-during-the-api-request-on-wordpress-3?replies=37

*** QuickLaTeX cannot compile formula:
\dfrac{3}{1}=\dfrac{v}{u}

*** Error message:
Cannot connect to QuickLaTeX server: cURL error 52: Empty reply from server
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http://wordpress.org/support/topic/an-unexpected-http-error-occurred-during-the-api-request-on-wordpress-3?replies=37

*** QuickLaTeX cannot compile formula:
v=3u

*** Error message:
Cannot connect to QuickLaTeX server: cURL error 52: Empty reply from server
Please make sure your server/PHP settings allow HTTP requests to external resources ("allow_url_fopen", etc.)
These links might help in finding solution:
http://wordpress.org/extend/plugins/core-control/
http://wordpress.org/support/topic/an-unexpected-http-error-occurred-during-the-api-request-on-wordpress-3?replies=37

The distance of image will three times of object distance.

Hence, The distance of the screen from the mirror is 3u.