If a wave from one slit of a young\'s double-slit set-up the screen one waveleng

Question

If a wave from one slit of a young's double-slit set-up the screen one wavelength behind the wave from the other, what is observed at that point? a. dark fringe b. bright fringe c. multi-colored fringe d. grey fringe, neither dark nor bright A Young's double slit has a separation of 2.50 times 10^-5 m on which a monochromatic light beam is directed. The resultant bright fringes on a screen 1.00 m from the double slit are separated by 2.30 times 10^-2 m. What the wavelength of this beam? (1nm = 10^-9 m) a. 373 nm b. 454 nm c. 575 nm d. 667 nm

Explanation / Answer

here,

13)

the object distance , do = 40 cm

the image distance , di = - 10 cm

let the focal length be f

1/f = 1/di + 1/do

1/f = - 1/10 + 1/40

f = - 13.3 cm

the focal length of the lens is b) - 13.3 cm

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