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A compound lens has been formed by joini...

A compound lens has been formed by joinined a convex and a concave lens, each of focal length 30 cm. what is the focal length of the combination? What will be the power ?

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The correct Answer is:
Infinite, zero
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SL ARORA-RAY OPTICS-Problems For Self Practice
  1. In the following ray diagram are given the position of an object O, im...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  18. Show that a light ray will pass through an equilateral glass prism (mu...

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  19. A ray of light falls on a normally on a refracting face of a prism. Fi...

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  20. A ray of light is incident on the glass prism at an angle of 40^(@). F...

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