The defect of vision in which the lens becomes opaque is called MCQ with Answer and Explanation

Explanation:
Momentum conservation: 0 = 0.02×500 + 5×v => v = -10/5 = -2 m/s (magnitude 2 m/s).

Explanation:
Wavelength is distance between successive crests or successive troughs.

Explanation:
For spring-mass system undergoing SHM, time period T = 2π√(M/k), derived from F = -kx = Ma ⇒ a = -(k/M)x, so ω² = k/M, T=2π/ω=2π√(M/k). Option B has inverse ratio; C misses factor 2; D is for pendulum. Memory tip: 'Spring: T ∝ √(M/k); Pendulum: T ∝ √(l/g)'. This standard formula is frequently tested in oscillations sections of competitive exams. Always verify dimensions: √(kg / (N/m)) = √(kg·m/N) = √(s²) = s, correct for time period.