Question

An object is kept at a distance of 3.5cm in front of a concave lens whose focal length is 2.5cm.draw a ray diagram to show the position and nature of the image

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)

solution

expand