a pinhole camera is placed 300cm in front of a building so that the image is formed on a screen 5cm from the pin hole. if the image is 2.5cm high. the height of the building will be?


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Question Number 132900 by aurpeyz last updated on 17/Feb/21

$a p i n h o l e c a m e r a i s p l a c e d 300 c m$ $i n f r o n t o f a b u i l d i n g s o t h a t t h e i m a g e$ $i s f o r m e d o n a s c r e e n 5 c m f r o m t h e$ $p i n h o l e . i f t h e i m a g e i s 2.5 c m h i g h .$ $t h e h e i g h t o f t h e b u i l d i n g w i l l b e ?$
Commented by mr W last updated on 17/Feb/21

$s u p p o s e d y o u {d o n}^{'} t m e a n a r e a l$ $b u i l d i n g f o r h u m a n, b u t a d o g h o u s e .$ $\frac{x}{300} = \frac{2.5}{5}$ $\Rightarrow x = 150 c m$ $t h e h e i g h t o f d o g h o u s e i s 150 c m .$
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