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The radii of curvature of the faces of a double convex lens are 20 cm and 30 cm. Its focal length is 24 cm. What is the refractive index of the glass?

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PUNJAB BOARD PREVIOUS YEAR PAPERS-Refraction of Light and Lenses-EXERCISE
  1. For the same angle of incidence, the angle of refraction in three diff...

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  2. Two lenses, one diverging of power 2D and the other converging of powe...

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  3. The radii of curvature of the faces of a double convex lens are 20 cm ...

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  4. A convex lens has 10 cm focal length in air.What is its focal length i...

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  5. If the critical angle for total internal reflection from medium to vac...

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  6. The radii of curvature of the faces of a double convex lens are 20 cm ...

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  7. A convex lens has 12 cm focal length in air. What is its focal length ...

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  8. The radii of curvature of the faces of a double convex lens are 10 cm ...

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  9. A convex lens has 20 cm focal length in air.What is its focal length i...

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  10. A concave lens is placed in contact with a convex lens of focal length...

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  11. A convex lens has 10 cm focal length in air.What is its focal length i...

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  12. A concave lens is kept in contact with convex lens of focal length 20 ...

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  13. A convex lens is made of glass of refractive index 1.5. If radius of c...

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  14. A needle placed 45cm from a lens forms an image on the screen placed 9...

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  15. A lens of focal length 12 cm produces a virtual image. The size of ima...

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  16. The image formed by the lens is erect and its length is three times th...

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  17. A lens placed at a distance of 20 cm from an object produces a virtual...

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  18. A needle placed 40 cm from a lens forms an image on a screen placed 80...

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  19. What is the focal lengthof the combination of a convex lens of focal l...

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  20. An object of size 5 cm is placed at distance of 25 cm in front of a co...

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