Question

Match the minerals in Group I with their highest order of interference color in Group II (for 0.03 mm mineral thickness).

Group I	Group II
P. Sillimanite	1. First order
Q. Quartz	2. Second order
R. Muscovite	3. Greater than third order
S. Calcite	4. Third order variegated

• (A) P – 2, Q – 4, R – 1, S – 3
• (B) P – 3, Q – 1, R – 2, S – 4
• (C) P – 2, Q – 1, R – 4, S – 3
• (D) P – 4, Q – 2, R – 3, S – 1

Answer 1

The Correct Option is C

Matching Minerals with Their Highest Order of Interference Color 

The interference color of minerals depends on their optical properties and thickness. For a standard thickness of 0.03 mm, the highest order of interference colors for the given minerals is as follows:

• Sillimanite (P): Exhibits a second-order interference color.
• Quartz (Q): Exhibits a first-order interference color.
• Muscovite (R): Exhibits an interference color of greater than third-order.
• Calcite (S): Exhibits a third-order variegated interference color.

Step 2: Matching the Correct Interference Color Orders

The correct sequence is:

\[ \mathbf{P - 2^{nd}, \quad Q - 1^{st}, \quad R > 3^{rd}, \quad S - 3^{rd}} \]

Final Answer:

Hence, the correct matching follows: P - 2nd, Q - 1st, R > 3rd, S - 3rd.