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Find the focal length of a lens of power...

Find the focal length of a lens of power- 2.0 D.What type of lens this?

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Define focal length of a lens

An object is 2m away from a lens. Which forms an erect image 1/4th the size of the object, determine the focal length of the lens.What type of the lens is this?

The image formed by the lens is erect and its length is three times the length of an object. If the focal length of the lens is 15 cm, what kind of lens it is ? Calculate the object and image distance.

If the focal length of a converging lens is 50 cm. What is the power of the Lens ?

A person needs a lens of power -5.5 d for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 D. What is the focal length of lens required for correcting(i) distant and (ii) near vision?

Is focal length of eye lens fixed? If not, why?

PSEB-LIGHT - REFLECTION AND REFRACTION-Exercise
  1. Which one of the following material 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 mirror,your image appear erect.The ...

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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 situation: head light of...

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

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

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

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

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

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

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

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

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

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  18. Find the focal length of a lens of power- 2.0 D.What type of lens this...

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  19. A doctor has prescribed a corrective lens of power+ 1.5 D.Find the foc...

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