Question

The focal length of a concave mirror is 30 cm. Find the position of the object in front of the mirror so that the image is three times the size of the object.​

Answer 1

Answer:

u=-20

Explanation:

u=-20

...........,hope its right answer

Answer 2

Answer:

U = - 10

M = h1 / h0

H1 = 3H0

M= h1/ H0 = - V/U

M= 3Ho/H0 = - V/-10

M= 3 = V/10

30cm = v