Question

An object is placed 20 cm in front of a convex mirror. The focal length of the mirror is 15 cm. The image characteristics are…

Answer 1

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Distance of object = 20cm

Focal length = 15cm

Type of mirror : convex

We have to find characteristics of image$.$

Focal length of convex mirror is taken positive.

☃ Position of image :

⇒ 1/u + 1/v = 1/f

⇒ 1/(-20) + 1/v = 1/15

⇒ 1/v = 1/15 + 1/20

⇒ 1/v = (4 + 3) / 60

⇒ v = 60/7

⇒ v = 8.57cm

☃ Nature of image :

➝ m = -v/u

➝ m = -8.57/(-20)

➝ m = 0.42

Here, 0 < m < +1

Therefore image will be virtual and erect.