Youmna physics ocr a .
| Front | When are points in phase / out of phase / antiphase |
| Back | In phase : path difference is ' n wavelengths 'Antiphase : Path difference is '(n + 0.5) wavelengths' Out of phase : neither in phase / antiphase |
| Front | Derive critical angle eq |
| Back |
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| Front | Equation for moment |
| Back | Force x perpendicular distance of the line if action of force from the axis or point of rotation |