Question

In A Young Double Slits Experiment The Difference in optical path lengths between the Rays Starting From the Two Slits S1 and S2 and Reaching a point A on the screen is 0.0075mm and reaching another point B on The Screen on The Other Side Of The Central Fringe is 0.0015mm. How Many Bright and Dark Fringes Are Observed between A And B If The Wavelength of Light Is 6000A° ?

Answer 1

Explanation:

For Point P,

S2P−S1P=(2n−1)2λ⇒0.0075×10−3=2(2n−1)6×10−7⇒n=13

i.e, 13th band will occur at P.

∴12 bright bands between P and centrer bright band

For point Q

S2Q−S1Q=(2n−1)2λ0.0015×10−3=2(2n−1)6×10−7⇒n=3

i.e, 3th dark band at Q 

∴ No. of bright bands betwween Q and central bright fringe =2

∴ Total bright bands between P and Q

12+2+1  (Central bright band)

⇒15

Answer 2

Explanation:

In Young's experiment, the wavelength of monochromatic light used is 6000 Ao. the optical path difference between the rays from the two coherent sources at point P on the screen is 0.0075 mm and at a point Q on the screen is 0.0015 mm. How many bright and dark bands are observed between the two points P and Q

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