An object is placed 30 cm in front of a concave mirror of focal length 20cm. Calculate the distance between the object and the image.

Ikoifrancisusang

5 years ago

It would have been 90cm if we were dealing with a converging lens. The right answer is 30cm since the image formed is a real image🤗

afooo

9 years ago

Here is an explanation:

image formula is 1/f=1/v+1/u

f=20 u=+30(concave mirror) v=?

1/20-1/30=1/v

1/v=1/60

v=60cm

distance between image and object=v+u

=60+30

=90cm

REF: check secondary school physics

BroTolu

4 years ago

30cm is correct 💪💪

Goodluckolusayo

3 years ago

both image is formed on the same side with the object, so the distance between them will be 60-30 to give 30

Ify4382

4 months ago

your answer was wrong

Myschool Kelly

9 years ago

Correction has been made. Thanks for your contributions.

DrKim

4 years ago

good day every one I think the answer is 30cm because in a concave mirror for object distance greater than the focal length the image is on the same side of the object therefore distance between object and image is 60-30 = 30cm
thanks.

GeraldChibuike

9 years ago

@ afoo I agree with U. I solved it and I also got 90cm. I.e v+u. 60+30=90cm