an object placed 20cm from a con− verving lens forms a mavnified clear image on the screen. when the lens is moved 20cm towards the screen a smaller clear image is formed on the screen. calculate the focal length of the lens


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Question Number 133281 by aurpeyz last updated on 20/Feb/21

$a n o b j e c t p l a c e d 20 c m f r o m a c o n -$ $v e r v i n g l e n s f o r m s a m a v n i f i e d c l e a r$ $i m a g e o n t h e s c r e e n . w h e n t h e l e n s$ $i s m o v e d 20 c m t o w a r d s t h e s c r e e n$ $a s m a l l e r c l e a r i m a g e i s f o r m e d o n$ $t h e s c r e e n . c a l c u l a t e t h e f o c a l l e n g t h$ $o f t h e l e n s$
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