Answer:
(B) +18 cm
Explanation:
Given that the distance of the object is infinity.
And the image is formed at a distance of 18 cm, means .
Now as we know that the mirror formula is,
Now put the values of u and v
Therefore the focal length of the mirror is +18 cm.
On a roller coaster, the greatest potential energy is at the highest point of the roller coaster
P always P because P is an awkward Dorian letter that can always be trusted