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Where should the object be placed, if a magnification of $- 0.75$ with a convex lens of focal length $8 cm$ ?

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At less than

8 cm

Between

8 cm

and

16 cm

Beyond

16 cm

16 cm

answer is C.

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Detailed Solution

The object be placed beyond

16 cm

,if a magnification of

- 0.75

with a convex lens of focal length

8 cm

.
When the magnification of the image is

- 0.75

then the size of the image will be slightly diminished. This condition happens only when the object is placed at beyond

2 f .

= 2 \times f

= 2 \times 8

= 16 cm .

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