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When are bifocal lenses used in spectac...

When are bifocal lenses used in spectacles?

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When a person cannot see nearby objects as well as distant objects clearly, bifocal lenses are used in spectacles.
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Aniket from Std. X uses spectacles. The power of the lenses in his spectacles is -0.5 D. State the type of lenses used in his spectacles.

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Aniket from Std. X uses spectacles. The power of the lenses in his spectacles is -0.5 D. Find the focal length of the lenses used in his spectacles.

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Surabhi from Std.X uses spectacles. The power of the lenses in her spectacle is 0.5 D. Answer the following question from the given information: (i) Identify the type of these used in her spectacles. (ii) Identify the defect vision Surabhi is suffering from. (iii) Find the local length of the lenses used in her spectacles.

Find the focal length of the lenses used in spectacles of a person if the power of the spectacles is 0.5D.

NAVNEET PUBLICATION - MAHARASHTRA BOARD-LENSES-Answer the following questions :
  1. Anil’s uncle cannot see nearby objects clearly, but he can see...

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  2. Anil’s uncle cannot see nearby objects clearly, but he can see...

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  3. When are bifocal lenses used in spectacles?

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  4. Aniket from Std. X uses spectacles. The power of the lenses in his ...

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  5. Aniket from Std. X uses spectacles. The power of the lenses in his ...

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  6. Aniket from Std. X uses spectacles. The power of the lenses in his ...

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  7. Sunita from std. X uses spectacles . Her spectacle number is -1.5 D . ...

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  8. Sunita from std. X uses spectacles . Her spectacle number is -1.5 D . ...

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  9. Sunita from std. X uses spectacles . Her spectacle number is -1.5 D . ...

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  10. Surabhi from Std. X uses spectacles. The power of the lenses in her sp...

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  11. Surabhi from Std. X uses spectacles. The power of the lenses in her sp...

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  12. Surabhi from Std. X uses spectacles. The power of the lenses in her sp...

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  13. My grandfather uses a bifocal lens in his spectacles. Explain why.

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  14. State used of a concave lens.

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  15. State used of a convex lens.

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  16. What is meant by the apparent size of an object ? With a neat and labe...

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  17. With a neat labelled diagram, explain the working of a simle microscop...

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  18. What does a simple microscope consist of ? What is the order of magni...

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  19. With a neat labelled diagram, explain the construction and working of ...

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  20. State two uses of a compound microscope .

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