Question

4.
The image formation in a convex lens
is shown in the following figure.
А.
IC С
B F.
H20cm
F,
B'
2F,
A'
2
20cm
AB is the object and A'B' is the image.
The focal length of the lens is :
A) 40 cm
B) 10 cm
C) 20 cm
D) 05 cm​

Answer 1

Answer:

10 cm

Explanation:

i think so

if wrong please tell the correct

Answer 2

Explanation:

From

f

1

=(μrel −1)( R

1

1

−

R

2

1

)

Focal length of lens will change hence image disappears from the screen