Question

128. The focal length of a convex lens is 12 cm. When the
object is at a point beyond 24 cm from the lens, the image
on the other side of the lens will be formed at
(a) 15 cm
(b) 24 cm
(c) 12 cm
(d) infinity
.
.
..
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Answer 1

Answer:

infinity is right answer follow me

Answer 2

Answer:

The image  on the other side of the lens will be formed at 24cm .

Explanation:

• Focal length of lens = +12cm
• Object distance = -24 cm
• Image distance = ?

We know the lens formula that is :

1/v-1/u =1/f

1/v-1/-24=1/12

1/v =1/12 + 1/-24

1/v =1/12-1/24

1/v=2-1/24

v=24cm