Question

The following question contains two statements labeled ‘A’ and ‘R’. Examine each statement carefully and decide, if the assertion ‘A’ and reason ‘R’ are individually correct. If so, decide, whether the reason R is the correct explanation of A. Select your answer, using the options given below.

A No refraction of light takes place when the rays strike another medium at right angles.

R It is a special case of refraction of light.

• A. Both ‘A’ and ‘R’ are correct and ‘R’ is the correct explanation of ‘A’
• B. Both ‘A’ and ‘R’ are correct and ‘R’ is the not correct explanation of ‘A’
• C. ‘A’ is correct, but ‘R’ is incorrect.
• D. ‘A’ is incorrect, but ‘R’ is correct.

Answer 1

The correct option is B

Both ‘A’ and ‘R’ are correct and ‘R’ is the not correct explanation of ‘A’

Explantion for assertion:

1. When a light ray strikes another medium at right angles it passes undeviated along the normal.
2. It is a special case of refraction of light when the light ray strikes at an angle of 90°.

Explanation for reason:

1. When a light ray enters obliquely from one optical medium to another, it bends.
2. When a light ray enters from one optical medium to another making an angle of 90°, it does not bend.
3. Thus, it is a special case of refraction.

So, the given assertion and reason are correct but the reason statement does not explain the assertion.

Hence, the correct option is B (Both ‘A’ and ‘R’ are correct and ‘R’ is not the correct explanation of ‘A’).