The colour of light that deviates least in a glass prism is
A. Red
B. Green
C. Blue
D. Violet
Answer: Option A
Solution (By JKSSB Mock Tests)
Dispersion: red has longest wavelength, lowest refractive index, deviates least. Violet deviates most. So spectrum: red at top (least deviation), violet at bottom.
Explanation:
Sound waves in air are longitudinal, particles vibrate parallel to wave propagation. Light and radio are electromagnetic, transverse. Waves on a string are transverse. In fluids, only longitudinal mechanical waves can propagate.
Explanation:
Logic gates process digital signals. An AND gate acts like two switches in series. Current (a logic HIGH or 1) will only flow to the output if Switch A AND Switch B are closed (HIGH). The truth table for an AND gate shows output = 1 solely when Input A = 1 and Input B = 1. In all other combinations, the output is strictly 0.
Explanation:
Power P = 1/f (in metre). f = 1/P = 1/2 = 0.5 m = 50 cm. Positive power indicates convex lens. For concave lens, power negative. Dioptre (D) is SI unit of power. Remember f in metres.
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