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Question Number 47713 by ajfour last updated on 13/Nov/18

Commented by ajfour last updated on 13/Nov/18

$I f c y l i n d e r h a s l e n g t h L, f i n d$ $h o w m u c h a r e a o f c y l i n d e r$ $r e c e i v e s l i g h t f r o m t h e p o i n t$ $s o u r c e a t a d i s t a n c e d a n d a t$ $s a m e l e v e l h = R a s i t s a x i s .$ $(i n s t e a d o f h = \frac{R}{2} i n d i a g r a m) .$
Commented by mr W last updated on 13/Nov/18

$A_{l i g h t e d} = 2 θ R L = 2 R L \cos^{- 1} \frac{R}{d}$
Commented by mr W last updated on 14/Nov/18

Commented by ajfour last updated on 14/Nov/18

$T h a n k y o u S i r, i u n d e r s t o o d m y$ $p o o r r e c o g n i t i o n!$
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