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A doctor has prescribed a corrective len...

A doctor has prescribed a corrective lens of power+ 1.5 D.Find the focal length of lens.Is prescribed lens diverging or converging?

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`P = 1/f`
`1.5 = 1/f`
`f = 1/(1.5) m = 10/15 m `
= `2/3 m = + 0.67 ` m
Focal length of the lens is `+ 0.67 ` m . The prescribed lens is converging in nature .
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NAND LAL PUBLICATION-LIGHT : REFLECTION AND REFRACTION -EXERCISES
  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: Solar furnace

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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 25cm away from a converging lens of f...

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

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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 plane mirror is +1. What does this mean?

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  14. An object 5.0 cm of 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 this...

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

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