Question

If the height of the object in the previous problem is 1.2 Cm, but will be the height of the image

Answer 1

Explanation:

Given :-

h

0

=1.2m

f=−20cm

ν=−60cm

from image formula,

v

1

+

u

1

=

f

1

−60

1

+

u

1

=

−20

1

u

1

=

60

1

−

20

1

=

60

−2

u=−30cm

Magnification, m=

u

−v

=

−30

−(−60)

=−2

m=

h

0

h

i

=−2

h

i

=−2×1.2=−2.4m

h

i

=−2.4m

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Answer 2

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