Object floats with 40% volume submerged. Density ratio (object/liquid) is: MCQ with Answer and Explanation

Explanation:
Boiling point of water = 100°C = 100 + 273.15 = 373.15 K. Melting point of ice 0°C = 273.15 K. Kelvin is SI unit, no degree symbol.

Explanation:
Diffraction causes light waves to spread when passing through apertures or around obstacles, creating Airy patterns instead of point images. This fundamental wave effect limits the minimum resolvable detail (Rayleigh criterion: θ_min ≈ 1.22λ/D). Options B, C, D are practical limitations but not the fundamental diffraction limit. Memory tip: 'Diffraction limit: smaller λ or larger aperture ⇒ better resolution'. This wave optics concept is frequently tested in competitive exams. Always distinguish fundamental limits (diffraction) from technical limitations (aberrations, turbulence) in instrument performance.

Explanation:
a' = (F/2)/(2m) = F/(4m) = a/4.