Question

If the screen was 30 cm behind the fish, what was the distance spanned by the diffraction spot as it moved back and forth? the screen was in the tank with the fish, so that the entire path of the laser was in water and tissue with an index of refraction close to that of water. The properties of the diffraction pattern were thus determined by the wavelength in water

Answer 1

The distance spanned by the diffraction spot can be calculated using the single-slit diffraction equation: y = (λL) / (D). In this case, the wavelength is in water.

Step-by-step explanation:

The distance spanned by the diffraction spot as it moved back and forth can be calculated using the concept of single-slit diffraction.

The equation that relates the distance (y) between the center of the pattern and the minimum to the wavelength (λ), slit width (D), angle (θ), and distance between the screen and the slit (L) is given by:

y = (λL) / (D)

In this case, the entire path of the laser is in water, so the properties of the diffraction pattern are determined by the wavelength in water.

Let's assume that the wavelength of the laser in water is λw.

Using the above equation, the distance spanned by the diffraction spot can be calculated as:

y = (λwL) / (D)