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A doctor has prescribed lens of power + ...

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

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Power of lens, `P=1//f`
`P=1.5D`
`f=1//5=10//15=0.66 m`
A convex lens has a positive focal length. Hence, it is a convex lens or a converging lens.
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NCERT-LIGHT - REFLECTION AND REFRACTION-Exercise
  1. Define one dioptre of power of a lens.

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  2. A convex lens forms a real and inverted image of a needle at a distanc...

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  3. Find the power of a concave lens of focal length 2 m.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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