Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R) Assertion (A) : Refractive index of glass is higher than that of air. Reason (R) : Optical density of a medium is directly proportionate to its mass

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Q.
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R)

Assertion (A) : Refractive index of glass is higher than that of air.

Reason (R) : Optical density of a medium is directly proportionate to its mass density which results in a proportionate refractive index.

In the light of the above statements, choose the most appropriate answer from the options given below: [2025]

1 (A) is not correct but (R) is correct

2 Both (A) and (R) are correct and (R) is the correct explanation of (A)

3 (A) is correct but (R) is not correct

4 Both (A) and (R) are correct but (R) is not the correct explanation of (A)

Ans.
(3)

Speed of light $v = \frac{c}{μ}$

for air v $\approx$ c, for glass v < c so $μ_{g} > μ_{a}$

Refractive index has no relation with mass density because both have different meaning. Hence reason is incorrect.

It means (A) is correct but (R) is not correct.

Solution

1 (A) is not correct but (R) is correct

2 Both (A) and (R) are correct and (R) is the correct explanation of (A)

3 (A) is correct but (R) is not correct

4 Both (A) and (R) are correct but (R) is not the correct explanation of (A)

Ans.
(3)

Speed of light $v = \frac{c}{μ}$

for air v $\approx$ c, for glass v < c so $μ_{g} > μ_{a}$

Refractive index has no relation with mass density because both have different meaning. Hence reason is incorrect.

It means (A) is correct but (R) is not correct.

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Solution

1 (A) is not correct but (R) is correct

2 Both (A) and (R) are correct and (R) is the correct explanation of (A)

3 (A) is correct but (R) is not correct

4 Both (A) and (R) are correct but (R) is not the correct explanation of (A)

Ans. (3) Speed of light v=cμ for air v ≈ c, for glass v < c so μg>μa Refractive index has no relation with mass density because both have different meaning. Hence reason is incorrect. It means (A) is correct but (R) is not correct.

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Ans.
(3)

Speed of light $v = \frac{c}{μ}$

for air v $\approx$ c, for glass v < c so $μ_{g} > μ_{a}$

Refractive index has no relation with mass density because both have different meaning. Hence reason is incorrect.

It means (A) is correct but (R) is not correct.