Question

The layer of the atmosphere near the earth's surface as compared to layers at higher altitudes is optically

• A. rarer
• B. denser
• C. both rarer and denser
• D. none of these.

Answer 1

The correct option is B

denser

Step 1: Layer of the atmosphere:

1. The atmosphere of the earth is not uniform.
2. As we go higher the density of the particles in the upper layers of the atmosphere decreases progressively.
3. As a result, the upper layers of the atmosphere are rarer than the lower layer.
4. Thus, the atmosphere is optically denser near the earth.

Hence, option (B) is correct.