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A convex lens from a real and inverted i...

A convex lens from a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle be placed in front of the convex lens if the image is equal to size of the object? Also, find the power of the lens?

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MBD-LIGHT:REFLECTION AND REFRACTION-EXAMPLE
  1. Define 1 dioptre of power of a lens

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  2. What is power of lens? Give commercial unit of power?

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  3. A convex lens from a real and inverted image of a needle at a distance...

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  4. Find the power of a concave lens of focal length 2 meters?

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  5. Which of the following materials cannot be used to make a lens?

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

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

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

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  9. No matter how you stand from a mirror, your image apperas erect.The mi...

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

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

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  12. Name the type of mirror used in the following situation: head light of...

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  13. Name the type of mirror used in the following situation: Sider/rear-vi...

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  14. Name the type of mirror used in the following situation: Solar furnace

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

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

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  17. A concave lens of focal length 15cm forms an image 10 cm from the lens...

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

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  19. The magnification produced by plane mirror is +1. What does this mean?

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

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