Physics - EM spectrum

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Here's the question:

which part of the electromagnetic spectrum has a refractive index of 1.45 in glass?

I've attempted to tackle it with
v = frequency x wavelength

refractive index = light speed in vacuum / light speed in material

but without success...

Help appreciated

Formulas won't help answering this question. There are some types of fused-quartz-based glass with a refractive index of 1.45 in the VISIBLE spectrum. Glass does not transmit most other parts of the EM spectrum. Howeverm glass transmits in parts of the near infrared, but with an index of less than 1.4 in most cases. It transmits in the NEAR portion of the ultraviolet with an index of 1.5 to 1.6, depending upon the glass type.

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