Correct option is B
Solution:
In a
plane (vertical) mirror, the
distance of the person from the mirror does not affect how much of the body is visible. The visible portion depends
only on the height of the mirror, not on how far the person stands.
Since Sachin sees
one-fourth of his body at 20 cm, he will see
the same fraction even after moving to 40 cm.
Correct answer:
(b) one-fourth


