✓ 5 MARKS
Long Answer
🔥 APPEARED IN 3 BOARD SETS
A parallel beam of light of wavelength $650\text{ nm}$ passes through a slit of width $0.6\text{ mm}$. The diffraction pattern is obtained on a screen kept $60\text{ cm}$ away from the slit. Find the distance between first order minima on both sides of the central maximum.
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2025 | Series 55-4 | Set 1 | Question 35(b)(ii) |
| CBSE 2025 | Series 55-4 | Set 2 | Question 32 |
| CBSE 2025 | Series 55-4 | Set 3 | Question 31 (b)(ii) |
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)