Question

an object of height 2 cm is placed in front of a converging lens of focal length 20cm and image is formed at a distance of 30 cm from the lens find the object distance and the height of the write characteristics of the image​

Answer 1

Answer:

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.