Question

Two big mirrors A and B are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he finds that the size of his face in mirror A goes on increasing but that in mirror B remains the same.

(a) mirror A is concave and mirror B is convex

(b) mirror A is plane and mirror B is concave

(c) mirror A is concave and mirror B is plane

(d) mirror A is convex and mirror B is concave

Answer 1

Explanation for correct option

1. Concave mirrors converges the light entering to it and form a image which is real and inverted, and also virtual and erect.
2. Depending on the position of the object, the position of the image varies i.e., the image size increases in some cases when the object is too nearer to the mirror.
3. Concave mirror forms virtual and erect image when object is placed between pole and focus of the mirror.

1. While in a plane mirror, there is no change in the size or position of the image respective of the object as it is a reflecting surface. It means the light entering into it, strikes back.

Explanation for incorrect options

1. Option (A) and option (D) has convex mirror and convex mirror forms diminished image.
2. In option (B) names of mirrors are interchanged.