Question

Focal Length of the Concave Mirror is 30 cm. Object Distance is 60 cm. Then the Image Distance is

A) +60cm
B) -30cm
C) -40cm
D) -60cm​

Answer 1

Answer:

-60 is the answer to this question

Answer 2

Answer:

The image distance is -60 cm.

Explanation:

The focal length of the concave mirror, f = -30 cm

The object distance, u = -60 cm

The mirror formula connecting the focal length (f), object distance (u), and image distance (v) is given as:

1/f = 1/u + 1/v

1/v = 1/f - 1/u

∴ v = uf / (u - f)

  v = (-60 × -30) / (-60 - -30)

  v = 1800 / -30

  v = -60 cm

So the image and object are at the same point, 60 cm in front of the concave mirror.