Question

If the height of the object in the previous problem is 1.2cm, what will be the height of the image?

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Answer 1

Given :-  

h0=1.2m

               f=−20cm

               ν=−60cm

from mirror formula,

               v1+u1=f1

               −601+u1=−201

               u1=601−201=60−2

u=−30cm

Magnification, m=u−v=−30−(−60)=−2

               m=h0hi=−2

               hi=−2×1.2=−2.4m

Answer 2

Answer:

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Explanation:

h0 = 1.2m

f = -20cm

v = -60

Mirror formula:-

1/f = 1/v + 1/u

1/-60 + 1/u = 1/-20

1/u = 1/60 - 1/20 = -2/60

u = -30

Magnification (m) = -v/u = -(-60)/-30 = -2

m =h1/h0 = -2

h1 = -2*1.2 = -2.4