Resolving Power Of Microscope — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Resolving Power of Microscope Optical Microscopes governed by Wave Optics (Diffraction) Analyze the diffraction pattern (Airy disk) formed by a circular aperture. Apply Rayleigh's Criterion: Two points are resolved if the central maximum of one diffraction pattern falls on the first minimum of the other. Determine the angular separation for the first minimum: 1.22 / D. Convert to linear separation (Limit of Resolution, d) considering the lens aperture geometry (NA = ): d = 1.22 / (2 ). Define Resolving Power as the reciprocal of the limit of resolution: RP = 1/d. Assumes a circular aperture. Valid based on Rayleigh's criterion for resolution. Theta represents the half-angle of the cone of light. Confusing Resolving Power with Limit of Resolution. Limit of Resolution is a distance (d); Resolving Power is 1/d. Higher RP means smaller d. Assuming is the full angle of the cone; it is the semi-vertical (half) angle. Believing higher wavelength improves resolution; actually, shorter wavelength (e.g., blue light, UV) increases Resolving Power.