What kind of lens can form : (a) an inverted magnified image ? (b) an erect magnified image ? (c) an inverted diminished image ? (d) an erect diminished image ?

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Solution

To answer this question, we need to list the properties of the images formed by both the convex and concave lenses.

The characteristics of the images depend on the position of the object.

CONVEX lens.

Object at 2F: Real, inverted and diminished.

Object at 2F: Real, inverted and same size as object.

Object between F and 2F : Real, inverted and magnified.

At F - Image formed at infinity.

Between F and O: virtual, upright and magnified.

CONCAVE LENS

At infinity : Formed at F, diminished, virtual and erect.

Between O and F: Erect, Virtual and diminished.

Any position between O and infinity : Erect, virtual and diminished.

From the information above the answers are:

(a) Convex lens

(b) Convex lens

(c) Convex lens

(d) Concave lens

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10 c m

.
(a)

8 c m

(b)

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(c)

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(d)

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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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