Question

for which of the following position of a real object a magnified feature limit is produced by a convex lens of focal length 30 cm square​

Answer 1

Here , f=15cm and 2f=30cm

(i) 20cm (Because a magnified real image is formed when the object is placed between f and 2f ).

(ii) 10cm ( Because a magnified virtual image is formed when the object is placed between f and the lens).

(iii) 35cm (Because a diminished real image is formed when the object is placed beyond 2f).

(iv) 30cm ( Because an image of same size as the object is formed when the object is placed at 2f).

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Answer 2

The object should be placed at 20 cm because a convex mirror forms a real, magnified image when an object is placed between f and 2f. (b) The object should be placed at 10 cm because a convex mirror forms a virtual, magnified image when an object is placed placed between f (focus) and the optic centre.