✓ 1 MARKS
Assertion-Reason
🔥 APPEARED IN 3 BOARD SETS
Assertion (A) : In Young's double-slit experiment, the fringe width for dark and bright fringes is the same.
Reason (R) : Fringe width is given by $\beta = \frac{\lambda D}{d}$, where symbols have their usual meanings.
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2026 | Series 55-5 | Set 1 | Question 14 |
| CBSE 2026 | Series 55-5 | Set 2 | Question 16 |
| CBSE 2026 | Series 55-5 | Set 3 | Question 13 |
02 // OFFICIAL CBSE MARKING SCHEME BREAKDOWN
- Step 1: Stating the fundamental formula / law statement (+1 Mark)
- Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
- Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)