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Find the focal length of a lens of power...

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

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Define focal length of a lens

An object is 2m away from a lens. Which forms an erect image 1/4th the size of the object, determine the focal length of the lens.What type of the lens is this?

The image formed by the lens is erect and its length is three times the length of an object. If the focal length of the lens is 15 cm, what kind of lens it is ? Calculate the object and image distance.

If the focal length of a converging lens is 50 cm. What is the power of the Lens ?

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?

MODERN PUBLICATION-REFLECTION AND REFRACTION-EXAMPLE
  1. An object 5.0 cm of length is placed at a distance of 20 cm in front o...

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

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

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

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  5. Under what condition in an arrangement of two plane mirrors incident r...

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  6. Draw a ray diagram to show the image formation by a concave mirror, wh...

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  7. Draw ray diagrams showing the image formation by a concave mirror when...

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

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  9. Draw ray diagrams showing the image formation by a concave mirror when...

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  10. Draw ray diagrams showing the image formation by a concave mirror when...

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  11. Draw a rays diagram showing the image formation by a convex mirror whe...

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  12. Draw a rays diagram showing the image formation by a convex mirror whe...

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  13. Size of image of an object by a mirror having a focal length of 20 cm ...

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  14. Identify the device used as a sphercal mirror or lens in following cas...

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  15. Identify the device used as a sphercal mirror or lens in following cas...

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  16. Identify the device used as a sphercal mirror or lens in following cas...

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  17. Identify the device used as a sphercal mirror or lens in following cas...

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  18. Why does a light ray incident on a rectangular glass slab immersed in ...

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  19. A pencil when dipped in water in a glass tumbler appears to be bent at...

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  20. How is the refractive index of a medium related to the speed of light?...

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