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Resolution and Numerical Aperture

🔬 Resolution and Numerical Aperture | Microscopy Explained Clearly In this lesson, we explain resolution and numerical aperture in microscopy, focusing on definitions, formulas, and exam-standard explanations. You will learn: • What resolution means in microscopy • Why resolution is more important than magnification • Factors that affect resolution (wavelength of light and numerical aperture) • The meaning of numerical aperture (NA) • How NA depends on the refractive index and angle of light entry • The resolution formula and how to use it • Why immersion oil improves resolution • Common exam misconceptions explained clearly 📐 Key Formulas Covered: Resolution (r) = λ / (2NA) Numerical Aperture (NA) = n sin θ Where: λ = wavelength of light n = refractive index of the medium θ = half-angle of the cone of light entering the objective lens 📚 This video is suitable for: • A-Level Biology • Senior Secondary School • Introductory Microscopy courses • Exam revision and practical preparation 👍 Like, Share & Subscribe for more clear, accurate, exam-ready science lessons.