Question

If an object is placed at 15 cm from a mirror then what will be the distance between image foamed and the mirror​

Answer 1

Answer:

When an object is placed at a distance of 15 cm from a concave mirror its image is formed at 10 cm in front of the mirror. When an object is placed at a distance of 15 cm from a concave mirror, its image is formed at 10 cm in front of the mirror

Answer 2

Answer:

u = -15cm, v = -10cm

f = ?

We know that

1/v + 1/u = 1/f

⇒ 1/(-10) + 1/(-15) = 1/f

⇒ 1/f = -(1/10) – (1/15) = (-3 – 2)/30 = - (5/30) = -(1/6)

∴ f = - 6 cm

∴ The focal length of the concave mirror is 6 cm