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Express the magnification produced by a ...

Express the magnification produced by a lens in terms of the local length of the lens and (1) the object distance (2) The image distance.

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Magnification (M) produced by a lens
`(h_(2) "(height of the image)")/(h_(2)"(height of the object)")`
`(v "(image distance)")/(u"(object distance)")`
Now, `1/v-1/u =1/f" "…` (Lens formula)
Where f is the focal length of the lens
`therefore u/v -u/v =u/f" "...` (1)
and `(v)/(u)- v/u =u/f " "...(2)`
(1) from Eq. (1) , we have
`u/v-1 =u/f`
`therefore u/v =u/f +1 =(u-f)/(f)`
`therefore M=v/u =f/(u+f)`
(2) From Eq. (2) , we have
`1-v/u =v/f therefore v/u=1-v/f =(f-v)/(f)`
`therefore M=v/u=(f-v)/(f)`
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NAVNEET PUBLICATION - MAHARASHTRA BOARD-LENSES-Answer the following questions :
  1. What is a lens formula ? State it.

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  2. What is meant by the magnification produced by a lens State the formul...

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  3. Express the magnification produced by a lens in terms of the local len...

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  4. An object is kept in front of a lens of focal length +10 cm. Describe ...

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  5. An object is kept in front of a lens of focal length +10 cm. Describe ...

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  6. Annu and Anand have concave and convex lenses respectively. They took ...

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  7. To obtain a magnified real image of a small film strip, which type of...

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  8. When an object of height 2 cm is placed in front of a convex lens, the...

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  9. You are given a lens which gives a virtual , erect and enlarged image....

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  10. When an object of height 3 cm is placed in front of a concave lens, th...

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  11. State used of a convex lens.

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  12. State used of a convex lens.

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  13. An object is kept in front of a lens of focal length-20 cm . Describe...

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  14. An object is placed in front of a convex lens of focal length 20 cm . ...

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  15. What is the power of a lens ?

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  16. What is the unit of power of a lens ? Define it .

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  17. What is the sign of the power of (i) a convex lens (ii) a concave lens...

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  18. If there is an increase or decrease in the focal length of a lens, wha...

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  19. If two lenses of focal lengths f(1) and f(2) are kept in contact with ...

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  20. Draw a neat labelled diagram to show the structure of the human eye.

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