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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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Define focal length of a lens

The focal length of a lens is expressed by which of the following:

A person needs a lens of power -5.5 d for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 D. What is the focal length of lens required for correcting(i) distant and (ii) near vision?

Is focal length of eye lens fixed? If not, why?

Power of a lens is -5d, its focal length is:

MBD-LIGHT:REFLECTION AND REFRACTION-EXAMPLE
  1. An object of size 7.0 cm is placed at 27 cm in front of a concave mirr...

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  2. Find the focal length of a lens of power- 2.0 D.What type of lens this...

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

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  4. Form the image in case an object is moved from infinity to the concave...

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  5. Describe with the help of diagram the natrue, size and position of the...

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  6. What is refraction of light?

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  7. Draw the ray diagrams and find position,nature and size of image forme...

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  8. Draw the ray diagrams and find position,nature and size of image forme...

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  9. Draw the ray diagrams and find position,nature and size of image forme...

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  10. Give the nature, position and size of the image formed by a convex len...

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  11. What is light, Give the nature of light.

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  12. Write the characteristics of light.

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  13. What are the various artificial sources of light ? Give examples

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  14. What is reflector?

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  15. What is reflection of light? State the laws of reflection of light.

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  16. What is the angle of incidence when incident ray falls normal to the m...

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  17. What is the angle of reflection when a ray of light is incident normal...

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  18. A ray of light falling normal to the mirror returns along the same pat...

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  19. Define the terms:Spherical mirror

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  20. Define the terms: concave mirror convex mirror

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