12.1 Diffraction from a Single Slit
12.2 Diffraction Grating
12.3 Resolving Power of Optical Instruments
Important Short Questions and Answers in Short
Q1. Define diffraction.
👉 Bending of light around edges or through narrow slits.
Q2. Condition for minima in single slit?
👉 asinθ=nλ
Q3. Formula for angular width of central maximum?
👉 Δθ=2λ/a
Q4. Condition for maxima in diffraction grating?
👉 dsinθ=nλ
Q5. What is resolving power?
👉 Ability to distinguish two close wavelengths R=λ/Δλ
Q6. Resolving power of grating?
👉 R=nN
✅ Formula Sheet (Quick Revision)
Numerical Examples
