Question

To obtain a magnification of, –2 with a convex lens of focal length 10 cm, the object should be placed
(a) between 5 cm and 10 cm
(b) between 10 cm and 20 cm
(c) at 20 cm
(d) beyond 20 cm

Answer 1

Explanation:

HEY BRO

HERE IS YOUR ANSWER

(b) between 10cm and 20cm

Magnification if -2 that means image is real and inverted and magnified.

And a convex mirror shows an image real,inverted and magnified when it is between F & 2F.

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Answer 2

The correct answer is option (b), that is, the placement of the object should be between 10 cm and 20 cm.

Explanation:

(a) The placement of the object should be at 20 cm. because, the image formed by the convex mirror is magnified and real when it is placed between f and 2f.

(b) The placement of the object should be at 10 cm. This is due to the reason that the image formed by the convex mirror will be magnified and virtual when it is placed between the optic centre and f (focus).

(c) The placement of the object should be at 35 cm.  

(d) The placement of the object should be at 30 cm.