Amirror produces an image that is located 34.0 cm behind the mirror when the object is located 7.50 cm in front of the mirror. what is the focal length of the mirror, and is the mirror concave or convex?

- 9.62 cm

Explanation:

location of image, v = + 34 cm

location of object, u = - 7.5 cm

Let f be the focal length of the mirror.

Use mirror formula,

1 / f = 1 / v + 1 / u

1 / f = 1 / 34 - 1 / 7.5

1 / f = (7.5 - 34) / (7.5 x 34)

f = - 9.62 cm

As the focal length is negative, so the mirror is concave in nature.

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