The near point of a normal human eye is MCQ with Answer and Explanation

Explanation:
Dispersion (splitting of white light into colors) occurs because refractive index n varies with wavelength (Cauchy's relation: n ∝ 1/λ² approximately). Since v = c/n, different colors travel at different speeds in the medium, causing different refraction angles (Snell's law). Frequency remains constant across media. Memory tip: 'Dispersion: n(λ) ⇒ v(λ) ⇒ different bending; violet bends most (highest n)'. This optics concept is frequently tested in competitive exams. Always distinguish cause (speed variation) from property (frequency/wavelength); competitive exams often test this nuanced understanding.

Explanation:
According to Archimedes' principle, the floating ice displaces a volume of water equal to its own weight. When the ice melts, it transforms into a volume of water that is exactly equal to the volume of water it displaced while floating. Therefore, the water level remains unchanged.

Explanation:
Kirchhoff's Current Law (First Law) states that the total current entering a junction must exactly equal the total current leaving that junction. Current is the rate of flow of charge. Therefore, this law simply affirms that electric charge cannot be created or destroyed at a circuit node; all charge arriving must depart. It is the conservation of charge.