Situation 18.2
An erect object is 50 cm from a concave mirror of radius 60 cm.
-In Situation 18.2,the distance of the image from the mirror,in cm,is closest to:

Question

Quizplus · Accepted Answer

Using the mirror formula,
1/v - 1/u = 1/f
where
v = distance of the image from the mirror
u = distance of the object from the mirror
f = focal length of the mirror

Since the mirror is concave, the focal length is negative:
f = -60 cm

Plugging in the given values:
1/v - 1/50 = 1/-60
1/v = -1/60 + 1/50
1/v = -5/3000 + 6/3000
1/v = 1/3000

v = 3000 cm = 30 m

Since the distance of the image is asked in cm, we need to convert the answer to cm:
30 m = 3000 cm

Therefore, the closest choice is D) 75 cm.

Situation 18.2 An Erect Object Is 50 Cm from a Concave Mirror