Question

describe the nature of the image formed when the object is placed at a distance of 15 cm from a concave mirror of a focal length 12 cm

Answer 1

Given

• Object distance (u) = -15cm
• Focal length (f) = - 12cm

To find

• Image distance (v)
• Nature of image

Solution

★ According to mirror formula

→ 1/u + 1/v = 1/f

→ -1/15 + 1/v = -1/12

→ 1/v = 1/15 - 1/12

→ 1/v = 12 - 15/180

→ 1/v = -3/180

→ v = -180/3 = -60cm

Hence

• Image distance = -60cm
• Nature of image= Real and inverted