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Which of the two has a greater power, a ...

Which of the two has a greater power, a lens of short length or a lens of large focal length?

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Lens of short focal length
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LAKHMIR SINGH & MANJIT KAUR-REFRACTION OF LIGHT-Exercise
  1. Define one dioptre of power of a lens.

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  2. Which type of lens has a) a positive power, and b) a negative power?

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  3. Which of the two has a greater power, a lens of short length or a lens...

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  4. How is the power of a lens related to its focal length?

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  5. Which has more power, a thick concave lens or a thin convex lens, made...

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  6. The focal length of a convex lens is 25 cm. What is its power?

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  7. What is the power of a convex lens of focal length 0.5 m?

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  8. A converging lens has a focal length of 50mm. What is the power of the...

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  9. What is the power of a convex lens whose focal length is 80 cm?

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  10. The power of a lens is +0.2D. Calculate its focal length.

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  11. The power of lens is, -2D. Calculate its focal length.

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  12. The optician's prescription for a spectacle lens is marked +0.5D. What...

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  13. What is the nature of a lens whose power of -4 D ?

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  14. The optician's prescription for a spectacle lens is marked +0.5D. What...

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  15. A doctor has prescribed a corrective lens of power, -1.5D. Find the fo...

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  16. A lens has a focal length of, -10cm. What is the power of the lens and...

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  17. The focal length of a lens is +150mm. What kind of lens is it and what...

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  18. Fill in the following blanks with suitable words: a) The reciprocal ...

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  19. An object of height 4 cm is placed at a distance of 15 cm in front of ...

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  20. An object of height 4.25 mm is placed at a distance 10 cm from a conve...

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