13.An object is placed in front of a convex lens produces m times magnified and erect image. Where will the object be placed to obtain an inverted image of same magnification ?

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A convex lens produces an inverted image magnified three times of an object placed at a distance of 15 col from it. Calculate focal length of the lens.

Q. Where should an object be placed so that a real and inverted image of same size is obtained using a convex lens?

Q. A convex lens has a focal length of 20 cm. Where should an object be placed in front of this convex lens so as to obtained an image which is real, inverted and same size as the object? Draw the ray diagram to show the formation of image in this case.

Q. An object is placed at the following distances from a convex lens of focal length

10 c m

.
(a)

8 c m

(b)

15 c m

(c)

20 c m

(d)

25 c m .

Which position of the object will produce ..............
i) a diminished, real and inverted image ?
ii) a magnified, real and inverted image ?
iii) a magnified, virtual and erect image ?
iv) an image of same size as the object ?

Justify your answer in each case.

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