Question

a convex lens forms a real and inverted image of an object at a distance 25 cm from the lens where will the image will be formed of the same size as the object also find power​

Answer 1

Answer:

v = +50 cm, u=?, P = ?

As image formed by lens is real, inverted of the same size, implies object is at 2F. So image is at 2F.

u = 2F = 50 cm

f = 50/2 = 25 cm

Answer 2

For convex lens,

h

2

h

1

=−

u

v

1=−

u

v

u=−v

According to the question,

Using lens formula, −

50

1

−

50

1

=

f

1

−

50

2

=

f

1

∴f=−25cm