Question

a burning candle placed 30cm in front of concavea burning candle placed 30cm in front of concave and it's image is formed at 15cm on the same side and find the focal length also with a diagram​

Answer 1

Here is your ANSWER,

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