Therefore, v1 = 30 cm. For a plane mirror, the object distance is 20 cm. Therefore, Image distance = 20 cm (Image I2) Final image I3 is formed after refraction from the lens for which I2 acts as an object. The distance of I2 from the lens is 10 cm. Therefore,
1
v3
−110 =
1
15
⇒
1
v3
=
1
10
+
1
15
=
5
30
⇒ v3 = 6 cm. The image is real and at a distance 10 + 6 = 16 cm.