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What is the power of a convex lens of fo...

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

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`+ 2 D`
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The power of a lens of focal length 0.5 m is :

The power of a lens of focal length 0.5 m is :

The power of a convex lens of focal length 25 cm is …………… .

LAKHMIR SINGH & MANJIT KAUR-REFRACTION OF LIGHT-Exercise
  1. Which has more power, a thick concave lens or a thin convex lens, made...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  17. A convex lens of power 5 D and a concave lens of power 7.5 D are place...

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  18. A convex lens of focal length 25 cm and a concave lens of focal length...

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  19. The power of a combination of two lenses X and Y is 5 D. If the focal ...

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  20. Two lenses A and B have focal length of +20 cm and, -10 cm, respective...

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