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Where should an object be placed in fron...

Where should an object be placed in front of a convex lens to get a real to get real image of the size of the object ?

A

At the principal focus of the lens,

B

At twice the focal length,

C

At infinity,

D

Between the optical centre of the lens and its principal focus.

Text Solution

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The object is to be placed at twice the focal length of the lens. Choice (ii) is correct.
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PRADEEP-REFLECTION AND REFRACTION-NCERT EXERCISE
  1. Which one of the following materials cannot be used to make a lens ?

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  2. The image formed by a concave mirror is observed to be virtual, erect ...

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  3. Where should an object be placed in front of a convex lens to get a re...

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  4. A spherical mirror and a thin spherical lens have each a focal length ...

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  5. No matter how far you stand from a spherical mirror, your image appear...

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  6. Which of the following lenses would you prefer to use while reading sm...

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  7. We wish to obtain an erect image of an object, using a concave mirror ...

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  8. Name the type of mirror used in the following situations : (a) Head ...

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  9. One half of a convex lens is covered with a black paper. Will this len...

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  10. An object 5 cm in length is held 25 cm away from a converging lens of ...

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  11. A concave lens has focal length of 15 cm. At what distance should an o...

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  12. An object is placed at a distance of 10 cm from a convex mirror of foc...

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  13. The magnification produced by a plane mirror is m = +1. What does this...

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  14. An object 5.0 cm in length is placed at a distance of 20 cm in front o...

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  15. An object of size 7.0 cm is placed at 27 cm in front of a concave mirr...

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  16. Find the focal length of a lens of power - 2.0 D. What type of lens is...

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  17. A doctor has prescribed lens of power + 1.5 D. Find the focal length o...

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