Question

State whether the following statement is True or False.

Electromagnetic radiations which can excite our retina have wavelengths between 8500 Å to 4500 Å.

Answer 1

This statement is false.

Explanation:

• The electromagnetic radiations which can excite our retina form the visible spectrum of light.
• The visible spectrum lies between about 8000 Å and 4000 Å (most of it lies between 7500 Å and 3900 Å).
• The radiations which can excite the retina and cause a sensation of colour have wavelengths between 8000 Å and 4000 Å, not 8500 Å to 4500 Å.