Question

if 2.5 cm height object place in front of convex lens of focal length 5 cm. if distance of the object from the lens is 15 cm ​

Answer 1

Answer:

Given : u=−15 cm F=+10 cm h

o

=2.5 cm

Using lens formula :

v

1

−

u

1

=

F

1

∴

v

1

−

(−15)

1

=

10

1

⟹F=+30 cm

Also m=

h

o

h

i

=

u

v

∴

2.5

h

i

=

−15

30

h

i

=−5 cm (- sign shows that image formed is inverted)