Question

Each question contains Statement I (Assertion) and Statement II (Reason). Each question has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.

Assertion-Reason

Statement I: As the light goes from one medium to another, the speed of light changes.

Statement II: Speed of light is a property of the medium.

Select the correct choice.

• A. Statement I is True, Statement II is True; Statement II is a correct explanation for Statement I
• B. Statement I is True, Statement II is True; Statement II is NOT a correct explanation for Statement I
• C. Statement I is True, Statement II is False
• D. Statement I is False, Statement II is True

Answer 1

The correct option is A

Statement I is True, Statement II is True; Statement II is a correct explanation for Statement I

Step 1: Explanation for the statement I

As the light goes from one medium to another, the speed of light changes.

1. Lightwave is a form of electromagnetic wave that does not require any for its propagation. Thus, it is not considered mechanical waves.
2. When light travels through one medium then another its frequency remains the same. But, both speed and wavelength vary because the speed of light changes according to the medium.

Step 2: Explanation for statement II

Speed of light is a property of the medium.

The speed of light is a property of the medium because the speed of these waves depends on the nature of the medium. It is approximately $3x{10}^{8}m/s$ in a vacuum.

So, a statement I is True, Statement II is True; Statement II is a correct explanation for Statement I.

Thus, option A is the correct option.