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Standard VIII

Physics

Laws of Reflection

An object is ...

Question

An object is placed at $8 c m$ from a convex lens of focal length $10 c m$ . At what point will we get a diminished real image?

20 c m

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Beyond

20 c m

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Between

f

and

2 f

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10 c m

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Solution

The correct option is A Beyond $20 c m$
Since we know that for a convex lens if an object is in between pole and focus of the mirror then image formed will be virtual, errect and enlarged, hence no real image will be formed.

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Similar questions

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 (h) between 10 cm and 20 cm (c) at 20 cm (d) beyond 20 cm

An object is placed at the following distances from a convex lens of focal length 15 cm : (a) 35 cm (b) 30 cm (c) 20 cm (d) 10 cm Which position of the object will produce : (i) a magnified real image ? (ii) a magnified virtual image ? (iii) a diminished real image ? (iv) an image of same size as the object ?

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.

Q. An object is placed at a distance of

10 c m

from a convex lens of focal length

20 c m

. Find the position and nature of the image.

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 ............

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An object is placed at 8cm from a convex lens of focal length 10cm. At what point will we get a diminished real image?

The correct option is A Beyond 20cmSince we know that for a convex lens if an object is in between pole and focus of the mirror then image formed will be virtual, errect and enlarged, hence no real image will be formed.

An object is placed at $8 c m$ from a convex lens of focal length $10 c m$ . At what point will we get a diminished real image?

The correct option is A Beyond $20 c m$
Since we know that for a convex lens if an object is in between pole and focus of the mirror then image formed will be virtual, errect and enlarged, hence no real image will be formed.