Question

real image 1/5th the size of object is formed at a distance of 18 cm from a mirror .what is the nature of mirror ?calculate its focal length​

Answer 1

nature is real and inverted ..

m=1/5

1/5=-18/u

u=-90cm

1/f=1/v+1/u

=-1/18-1/90

=-1/15cm

f=-15cm

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