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Physics

Mechanics

Easy

Question

$A space c o n v e x space l e n s space o f space f o c a l space l e n g t h space 20 space c m space p r o d u c e s space i m a g e s space o f space t h e space s a m e space m a g n i f i c a t i o n space 2 space w h e n space a n space o b j e c t space i s space k e p t space a t space t w o space d i s tan c e space x subscript 1 space a n d space straight x subscript 2 open parentheses straight x subscript 1 greater than straight x subscript 2 close parentheses space f r o m space t h e space l e n s. space T h e space r a t i o space o f space x subscript 1 space a n d space x subscript 2 space i s space colon$

$4 : 3$
$3 : 1$
$2 : 1$
$5 : 3$

The correct answer is: $3 colon space 1$

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