Question

image distance is equals to 16 cm, image height is equals to 4 cm, object height is equals to 2 cm, what is the focal length of the object​

Answer 1

Answer:

5 is the answer thank my answer

Answer 2

Answer:

When object is kept 16 cm away,

v

1

1

−

(−16)

1

=

f

1

............ (1)

Magnification=

(−16)

v

1

When object is kept 6 cm away,

v

2

1

−

(−6)

1

=

f

1

................ (2)

Magnification=

−6

v

2

Since the sizes of the images is same, M

1

=−M

2

Hence, v

2

=

8

3v

1

Using this relation in Equation 1 and Equation 2, we get

f=11cm