Question

The wavelengths used in various electronic distance measurement systems cover fairly the spectrum of range

• A. 40 m to 450 m
• B. 40 m to 450 mm
• C. 40 m to 450 $\mu$m
• D. 40 m to 450 nm

Hint:

EDM devices span from long-wavelength microwaves to short-wavelength visible light—ranging from 40 m to 450 nm.

Answer 1

The Correct Option is D

Electronic Distance Measurement (EDM) instruments operate over a wide range of wavelengths depending on the technology used. These include microwaves, infrared, and visible light. The effective range of wavelengths extends from about 40 meters (for microwaves) to as small as 450 nanometers (for visible light). This broad spectrum allows EDM instruments to be used in diverse surveying applications with high precision.