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Principal focus of convex lens:...

Principal focus of convex lens:

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When light rays parallel to the principal axis are incident on a convex lens, they converge to a point on the principal axis. This point is called the principal focus of the lens.
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Principal focus of concave lens:

The principal focus of a convex lens is virtual . True/False

An object placed at a distance of a 9cm from the first principal focus of a convex lens produces a real image at a distance of 25cm. from its second principal focus. then the focal length of the lens is :

Draw a ray diagram in each of the following cases to show the formation of image, when the object is placed : between optical centre and principal focus of a convex lens.

TARGET PUBLICATION-LENSES -Answer the following
  1. Write a short note on lens and its types.

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  2. Principal focus of convex lens:

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  3. Principal focus of concave lens:

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  4. Optical centre of convex lens:

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  5. State the rules to draw a ray diagram of a convex lens with proper fig...

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  6. State the rules used for drawing ray diagrams for the fomation of an i...

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  7. An object is placed at a distance equal to 2f in front of a convex len...

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  8. At which position will you keep an object in front of a convex lens to...

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  9. State the rules used fro drawing ray diagrams for the formation of an ...

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  10. When would virtual image be produced by convex lens? Why can virtual i...

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  11. State the rules used fro drawing ray diagrams for the formation of an ...

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  12. Explain Cartesian sign convention in case of refraction through lens.

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  13. What is the difference between focal length of convex and concave leng...

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  14. Use your brain power! M=(h(2))/(h(1))" …..(i)" M=(v)/(u)" …..(ii...

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  15. What is the power of a lens ?

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

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  17. Give an account of the structure of human eye.

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  18. What is the function of the iris and the muscles connected to the lens...

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  19. The order of the three layers of cells in the retina of human eye from...

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  20. Match the columns in the following table and explain them.

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