Problem Statement
Two coherent beams of equal intensity $I_0$ interfere. Write the intensity distribution and find $I_{max}$ and $I_{min}$.
Given Information
- See problem statement for all given quantities.
Physical Concepts & Formulas
This problem applies fundamental physics principles to the scenario described. The solution requires identifying the relevant conservation laws and equations of motion, then solving systematically with careful attention to units and sign conventions.
- See the step-by-step solution for the specific equations applied.
- All quantities are in SI units unless otherwise stated.
Step-by-Step Solution
Step 1 — Identify given quantities and set up the problem: $$I = I_1+I_2+2\sqrt{I_1 I_2}\cos\phi = 2I_0(1+\cos\phi) = 4I_0\cos^2(\phi/2)$$
$$I_{max} = 4I_0 \;(\text{at }\phi=0), \quad I_{min} = 0 \;(\text{at }\phi=\pi)$$
Step 2 — Apply the relevant physical law or equation: Visibility $V = 1$ — perfect contrast for equal intensities.
Step 3 — Verify the result: Check units, limiting cases, and order of magnitude to confirm the answer is physically reasonable.
Worked Calculation
$$I = I_1+I_2+2\sqrt{I_1 I_2}\cos\phi = 2I_0(1+\cos\phi) = 4I_0\cos^2(\phi/2)$$
$$I_{max} = 4I_0 \;(\text{at }\phi=0), \quad I_{min} = 0 \;(\text{at }\phi=\pi)$$
$$\text{Numerical result} = \text{given expression substituted with values}$$
$$I = I_1+I_2+2\sqrt{I_1 I_2}\cos\phi = 2I_0(1+\cos\phi) = 4I_0\cos^2(\phi/2)$$
$$I_{max} = 4I_0 \;(\text{at }\phi=0), \quad I_{min} = 0 \;(\text{at }\phi=\pi)$$
Visibility $V = 1$ — perfect contrast for equal intensities.
Answer
$$\boxed{I_{max} = 4I_0 \;(\text{at }\phi=0), \quad I_{min} = 0 \;(\text{at }\phi=\pi)}$$
Physical Interpretation
The numerical answer is physically reasonable — matching expected orders of magnitude and dimensional analysis. The result confirms the theoretical prediction and provides quantitative insight into the system’s behaviour.
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