Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Optical telescope uses rays of electromagnetic spectrum.

• A. Infrared
• B. Visible
• C. Ultra Violet

Answer 1

The correct option is B Visible

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Visible rays ranging between 400 - 700nm wavelength are used by the optical telescopes.