Question

In the human eye, snow blindness is caused by ____ radiations of ______ wavelength.

• A. UV-A ; 100 - 280 nm.
• B. UV-A ; 280 - 322 nm.
• C. UV-B ; 100 - 280 nm.
• D. UV-B ; 280 - 322 nm.

Hint:

Ozone depletion increases UV-B. High UV-B doses inflame the cornea.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept
Ultraviolet rays are grouped as UV-A, UV-B and UV-C by wavelength. UV-C is the shortest, about 100 to 280 nm.

Step 2: UV-B and the eye
UV-B lies between about 280 and 320 nm. High doses of UV-B inflame the cornea.

Step 3: Snow blindness
This inflammation, common where snow reflects light strongly, is snow blindness. So it is caused by UV-B of 280 to 322 nm.

Final Answer:
Snow blindness is caused by UV-B radiation of 280 to 322 nm wavelength. \[ \boxed{\text{(D) }\text{UV-B ; 280 - 322 nm.}} \]