Question

3. an object of height 20m is placed ada
distance of them in tvorst of a converging
at
the object distance and height of the
Write characteristics of the image.
lens of focal length 20cm. An image is formed
a distance of 30cm from the lons. Pind​

Answer 1

Explanation:

Size of object h

o

=2cm

Size of the object h

i

=?

Focal length f=−12cm

Object distance u=−20cm

Image distance v=?

Using mirror formula

f

1

=

v

1

+

u

1

−12

1

=

v

1

+

−20

1

v

1

=

60

−5+3

v=−30cm

Magnification (M)=

h

o

h

i

=

u

−v

=

−20

30

=−1.5

h

i

=−1.5×2=−3cm

Image will be real, inverted and magnified.