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Reflection by Plane Mirror

Practice Questions:

Question 21: easy

Assertion (A): It is never possible to produce a real image using a plane mirror.

Reason (R): Radius of curvature of a plane mirror is negative.

1. Both (A) & (R) are true and the (R) is the correct explanation of the (A)

2. Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

3. (A) is true but (R) is false

4. Both (A) and (R) are false

View Answer

Assertion (A) is true as plane mirrors always form virtual images.
Reason (R) is false because the radius of curvature of a plane mirror is infinite.
Therefore, (A) is true and (R) is false.

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Question 22: easy

Assertion (A): Law of reflection is applicable for all type of mirrors.

Reason (R): Rays which are parallel to the principal axis are known as paraxial rays.

1. Both (A) & (R) are true and the (R) is the correct explanation of the (A)

2. Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

3. (A) is true but (R) is false

4. Both (A) and (R) are false

View Answer

Assertion (A) is true. The laws of reflection hold for all types of mirrors.

Reason (R) is false. Paraxial rays are rays close to and making small angles with the principal axis; not all parallel rays are paraxial, nor are all paraxial rays parallel to the axis.

Hence, (A) is true and (R) is false.

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Question 23: easy

Assertion (A): When an object is placed between two plane parallel mirrors, all the images formed are of equal intensity.

Reason (R): In above situation of two plane parallel mirrors, only two images are possible.

1. Both (A) & (R) are true and the (R) is the correct explanation of the (A)

2. Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

3. (A) is true but (R) is false

4. Both (A) and (R) are false

View Answer

Assertion (A) is false. Image intensity decreases with each reflection due to absorption.
Reason (R) is false. An infinite number of images are formed between two parallel plane mirrors.
Therefore, both (A) and (R) are false.

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