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Two thin lenses, aone convex of focal le...

Two thin lenses, aone convex of focal length 10 cm and other concave lens are kept in contact to form a composite lens of focal length 13 cm . If the combination acts as a converging lense the focal length of second lens is

A

`-43.33 cm`

B

`- 5.65 cm`

C

`+ 5.65 cm`

D

`+ 43. 33 cm`

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TARGET PUBLICATION-OPTICS-EXERCISE
  1. Two thin converging lenses of focal length 15 cm and 30 cm are held i...

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  2. What is the focal of the combination of a convex lens of focal length...

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  3. Two thin lenses, aone convex of focal length 10 cm and other concave l...

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  4. Two lenses of power +12and-2 dioptres are placed in contact. What will...

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  5. When two or more lnses of magnification m(1) ,m(2), m(3) are kept in c...

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  6. The separation of whtie light into its constituent colours after passi...

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  7. A shaped triangular transparent block havin three rectangular planes ...

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  8. The angle between the two-plane rectangular refracing surface of a pri...

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  9. The rectangular face opposite to the refracting edge is called .

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  10. The refractivity of the material of the prism is given by

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  11. A glass prism placed in a homogeneous transparent medium will deviate ...

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  12. As the refractive index of the material of prism for different colours...

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  13. When while light passes through prism then constituent colours are obt...

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  14. A prism splits a beam of white light into its constituent colours. Thi...

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  15. Dispersion of light is shown in the following diagram, select the CORR...

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  16. The angle between incident ray and ray is called angle of deviation.

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  17. When white light passes through prism, the angle of deviation is

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  18. While deriving prism formula, angle of deviation is minimum if

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  19. In the position of minimum deviation when a ray of yellow light passes...

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  20. If the angle of prism is 60^(@) and the angle of minimum deviaton is 4...

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