Which of the following is an example of a longitudinal wave?
A. Water waves on the surface
B. Light waves
C. Sound waves in air
D. Radio waves
Answer: Option C
Solution (By JKSSB Mock Tests)
In a longitudinal wave, the particles of the medium vibrate back and forth parallel to the direction of wave propagation (creating compressions and rarefactions). Sound waves traveling through air are mechanical longitudinal waves. Light and radio waves are transverse electromagnetic waves, while surface water waves are a combination of both.
Explanation:
Myopia (nearsightedness) is the inability to see distant objects clearly, with far point less than infinity. Here, far point is 2 m. Corrected using concave lens. Hypermetropia (farsightedness) affects near vision; presbyopia is age-related loss of accommodation; astigmatism involves uneven corneal curvature. Memory aid: 'Myopia = near-sighted; far point reduced'. This application question tests knowledge of vision defects and corrections, frequently appearing in competitive exams. Always link symptom (blurred distant vision) to defect (myopia) and correction (diverging lens).
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