Question

Match List - I with List - II 

List - I	Type	List - II	Shape
A. Wave front (isotropic)	Isotropic	II	Sphere
B. Wave surface (isotropic)	Isotropic	IV	Circle
C. Wave front (anisotropic)	Anisotropic	I	Ellipse
D. Wave surface (anisotropic)	Anisotropic	III	Ellipsoidal

• A. A-II, B-IV, C-III, D-I
• B. A-IV, B-II, C-III, D-I
• C. A-II, B-IV, C-I, D-III
• D. A-IV, B-II, C-I, D-III

Hint:

Isotropic wave surface is spherical, while anisotropic wave surface is ellipsoidal.

Answer 1

The Correct Option is D

Concept:
Optical behaviour of isotropic and anisotropic minerals is represented by wave fronts and wave surfaces.

Step 1: Isotropic wave front.
In isotropic media, light travels with equal velocity in all directions. The wave front is circular. \[ A\rightarrow IV \]

Step 2: Isotropic wave surface.
In three-dimensional representation, the isotropic wave surface is a sphere. \[ B\rightarrow II \]

Step 3: Anisotropic wave front.
In anisotropic media, light velocity differs with direction. The wave front becomes elliptical. \[ C\rightarrow I \]

Step 4: Anisotropic wave surface.
The three-dimensional wave surface in anisotropic minerals is ellipsoidal. \[ D\rightarrow III \] Therefore, the correct matching is: \[ A-IV,\ B-II,\ C-I,\ D-III \] \[ \therefore \text{Correct Answer is (D)} \]