Question

to ignite some frequencies which lens is useful​

Answer 1

Answer:

A simple solution is to use two loops to count frequency of every element and keep track of maximum and minimum

Answer 2

Lens that are useful to ignite some frequencies:

• Instead of glass there are different types of lenses made out of different materials which are transparent for waves having shorter wavelength to Ignite the frequency of radio waves or microwaves.
• These waves  can be manipulated using different lenses made out of metals or plastics which like optical lenses may have different refractive indexes.
• But they transfer two radio waves and can focus them or disperse them as required.
• These lenses are used specially to Ignite the frequency but are not practical for waves that have much shorter wavelengths.

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