| Assertion (A): Wavefront emitted by a point source of light in an isotropic medium is spherical. |
| Reason (R): Isotropic medium has same refractive index in all directions. |
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is NOT the correct explanation of A
C) A is true but R is false
D) A is false and R is true
Correct Answer: A
Solution :
Option [a] is correct Explanation: If a medium has same refractive index at every point in all directions, then the wavefrom obtained from a point source in such a medium is spherical since wave travels in all direction with same speed. Such a medium is known as isotropic medium. So, the assertion and reason both are true and the reason explain the assertion properly.
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