Match List I with List - II.
| List – I | List – II | ||
|---|---|---|---|
| (A) | Used for LASIK eye surgery | (I) | X-rays |
| (B) | Used in remote switches | (II) | Microwaves |
| (C) | Used to detect crack in bridges | (III) | Infrared rays |
| (D) | Used in aircraft navigation | (IV) | Ultraviolet rays |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A)-(IV), (B)-(III), (C)-(I), (D)-(II)
The use of each part of the electromagnetic spectrum follows from its wavelength and the way it interacts with matter.
(A) Used for LASIK eye surgery — this matches (IV) Ultraviolet rays. The ultraviolet laser beam is absorbed in a very thin layer of the cornea and reshapes it precisely.
(B) Used in remote switches — this matches (III) Infrared rays. The remote of a television or similar device sends its signal as infrared radiation.
(C) Used to detect crack in bridges — this matches (I) X-rays. Their short wavelength lets them penetrate matter, so a hidden crack shows up on the film placed behind the structure.
(D) Used in aircraft navigation — this matches (II) Microwaves. Radar, which guides aircraft, works with microwaves.
NCERT (2026-27):
Microwaves – “… Due to their short wavelengths, they are suitable for the radar systems used in aircraft navigation.”
Infrared Waves – “… Electronic devices (for example semiconductor light emitting diodes) also emit infrared and are widely used in the remote switches of household electronic systems such as TV sets, video recorders and hi-fi systems.”
Ultraviolet Rays – “… Due to its shorter wavelengths, UV radiations can be focussed into very narrow beams for high precision applications such as LASIK (Laser- assisted in situ keratomileusis) eye surgery.”