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Summation by Sigma Method

Q 25. Y.D.S.E...

Question

Q 25. Y.D.S.E if the width of the slits are gradually decreased, then

(1) Bright fringe will become brighter and dark fringe become darker
(2) Bright fringe become bright and dark fringe become less dark
(3) Bright fringe become brighter and dark fringe became lighter
(4) Bright fringe become less bright and dark fringe become darker

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Solution

$D e a r S t u d e n t, \sin c e w h e n y o u d e c r e a s e t h e s l i t w i d t h t h e i n t e n s i t o f t h e l i g h t w i l l d e c r e a s e s . h e n c e t h e b r i g h t f r i n g e w i l l b e c o m e l e s s b r i g h t a n d d a r k f r i n g e b e c o m e s d a r k e r . a s t h e i n t e n s i t y r e d u c e t h e b r i g h t n e s s w i l l r e d u c e f o r t h e w h o l e s y s t e m . o p t i o n 4 R E g a r d s$

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