A monochromatic beam of laser light falls on a thin slit and produces a series o
ID: 2106163 • Letter: A
Question
A monochromatic beam of laser light falls on a thin slit and produces a series of bright and dark spots on a screen.If this apparatus (slit and screen) is submerged in water, the dark spots will not change their location on the screen will move away from the center spot will move toward the center spot A monochromatic beam of laser light falls on a thin slit and produces a series of bright and dark spots on a screen.
If this apparatus (slit and screen) is submerged in water, the dark spots will not change their location on the screen will move away from the center spot will move toward the center spot
Explanation / Answer
From y/L = m(wavelength)/a we can start
When you immerse the apparatus in water we have to apply n(wavelength) water = n(wwavelength)air
or wavelength water = wavelength air/nwater
Thus, the wavelength in the water will be decreased
If you decrease the wavelength, the value of y decreases. That means the dark spots are moving closer to the center.