Question

The focal length of a concave mirror is 30 cm, if an object is placed at a distance of 20 cm, calculate the position and nature of the image.

Answer 1

Answer:

Explanation:

Here,

u= -30 cm

f= -20 cm

By using mirror formula,

1/v + 1/u = 1/f

1/v + 1/-30 = 1/-20

v= -60 cm

negative sign indicates that image is in front of the mirror

Therefore,

The distance between image and object = 60–30 = 30cm