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In the diagram shows below rays are comi...

In the diagram shows below rays are coming from infinity and after passing through both the lenses meet on a screen placed at a distance of 30 cm from the concave lens. Calculate the focal length of the concave lens.

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The correct Answer is:
15 cm
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SL ARORA-RAY OPTICS-Problems For Self Practice
  1. A needle 10 cm long is placed along the axis of a convex lens of focal...

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  2. When a slide is placed 15 cm behind the lens in a projector, an image ...

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  3. In the diagram shows below rays are coming from infinity and after pas...

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  4. In the following ray diagram are given the position of an object O, im...

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  5. In the following diagram are shown the position of an object O, image ...

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  6. A compound lens has been formed by joinined a convex and a concave len...

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  7. Two thin lenses of power + 3 D and - 1 D are held contact with each ot...

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  8. A what distance must an object be placed from convex lens of power 4D ...

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  9. Find the focal length and power of a convex lens, which when placed in...

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  10. The power of a thin convex lens of glass is 5 dioptre. When it is imme...

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  11. A concave lens is kept in contact with a convex lens of focal length 2...

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  12. A compound lens is made of two lenses having powers +15.5 D and -5.5D....

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  13. Ray coming from an object situated at infinity, fall on a convex lens ...

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  14. A ray of light is incident at an angle of 60^(@) on one face of a pris...

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  15. The refracting angle of a glass prism is 60^(@). The value of minium d...

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  16. The refractive index of the material of a prism of 60^(@) angle for ye...

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  17. A ray of light incident at 49^(@) on the face of an equilateral prism ...

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  18. A glass prism has a refracting angle of 60^@. The angle of minimum dev...

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  19. A ray incident normally on one face of a right-angled isosceles glass ...

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  20. As shown in Fig. PQ is a ray incident on prism ABC. Show the correspon...

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