Young's Double-Slit Experiment

Laser

Top-down View

Wavelength ($\lambda$) 650 nm

Slit Separation ($a$) 0.40 mm

Screen Distance ($D$) 1.40 m

Fringe Separation ($\Delta y$) 2.28 mm

Challenge

Use only the sliders. Reach the target fringe separation.

Not started

Current $\Delta y$ 2.28 mm

Target: 3.00 mm

3D Optical Bench

Drag to rotate • Scroll to zoom

Light Slits Screen

Drag the purple marker to probe a point on the screen.

Position $y$

0.00 mm

Path difference $\Delta L$

0.00 nm

Phase difference

0.00 π

Intensity $I/I_0$

1.00

Nearest order $n$

Fringe type

Bright

$$ \Delta y = \frac{\lambda D}{a} $$

$$ I = I_0 \cos^2\left(\frac{\pi a y}{\lambda D}\right) $$

Try answering question (a)(i) from your sheet: How can you increase the average separation ($\Delta y$)?