Question

An object of height 10 cm is positioned 30 cm from a
concave mirror with a focal length 8 cm. find position of image?​

Answer 1

Answer:

Height of the object =2 cm

U(object distance) = -15 as u is always negative

F = -10 (as it is always negative for concave miror and lens )

1/F =1/v + 1/u

-1/10 = 1/v + (-1/15)

-1/10 +1/15 =v

-3+2/30 =v

V=-30cm

Hi/Ho = - V/U

Hi /2 = -(-30/15)

Hi =-30×2÷15

Hi =-4cm (Real and inverted)

Explanation:

Answer 2

Explanation:

h1 = 10cm, u = 30cm, f = 8cm

We know that

1/v + 1/u = 1/f

⇒ 1/v + 1/(30) = 1/(8)

⇒ 1/v = 1/30 – 1/8