An object is placed at a distance 40 cm from a convex lens of focal length 20 cm- The image formed is-real- inverted and enlargedvirtual- upright and of the same size as objectreal- inverted and diminishedreal- inverted and of the same size as object

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Standard VII

Physics

Image Formation by Lenses

An object is ...

Question

An object is placed at a distance 40 cm from a convex lens of focal length 20 cm. The image formed is:

real, inverted and enlarged

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virtual, upright and of the same size as object

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real, inverted and diminished

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real, inverted and of the same size as object

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Solution

The correct option is D
real, inverted and of the same size as object

When an object is placed at a distance equal to twice the focal length, the image formed is real, inverted and of the same size as the object.

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infront of a concave mirror of focal length

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Where must the object be placed for the image formed by a converging lens to be : (a) real, inverted and smaller than the object ? (b) real, inverted and same size as the object ? (c) real, inverted and larger than the object ? (d) virtual, upright and larger than the object ?

Complete the following sentences :

(a) An object is placed at a distance of more than 40 cm from a convex lens of focal length 20 cm. The image formed is real, inverted and ..........

(b) An object is placed at a distance 2f from a convex of lens of focal length f. The size of image formed is ............ that of the object.

(c) An object is placed at a distance 5 cm from a convex of focal length 10 cm. The image formed is virtual, upright and ............

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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An object is placed at a distance 40 cm from a convex lens of focal length 20 cm. The image formed is:

The correct option is D real, inverted and of the same size as objectWhen an object is placed at a distance equal to twice the focal length, the image formed is real, inverted and of the same size as the object.

The correct option is D
real, inverted and of the same size as object

When an object is placed at a distance equal to twice the focal length, the image formed is real, inverted and of the same size as the object.