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What will be the equivalent focal length...

What will be the equivalent focal length of a system consisting of a thin convex lens and a thin concave lens of same focal length f (a) when they are put in contact (b) when they are separated by a distance d=f (c) when they are separated by a distance, d = 3f ?

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AAKASH SERIES-RAY OPTICS-EXERCISE (VERY SHORT ANSWER QUESTIONS )
  1. It is possible for a lens to act as convergent in one medium and diver...

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  2. Can a single lens ever form a real and erect image?

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  3. If the two radii of a thin lens are not equal, will the focal length c...

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  4. What is the focal length if plane surface is silvered in previous illu...

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  5. What will be the equivalent focal length of a system consisting of a t...

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  6. An air bubble is formed inside water. Does it act as a converging lens...

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  7. As an object is moved from the surface of a thin converging lens to a ...

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  8. Define refracting angle and principal section of a prism

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  9. The graph between angle of deviation (delta) and angle of incidence (i...

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  10. Name the shape of wavefront after refraction of (1) Plane wavefront th...

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  11. What is angular dispersion? On what factors does it depend?

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  12. Can we have dispersion without deviation with a pair of prisms of the ...

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  13. Can a beam of white light when passed through a hollow prism give spec...

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  14. If three identical prisms are combined is it possible to pass a beam t...

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  15. Distinguish between a pure spectrum and an impure spectrum.

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  16. What is a line spectrum? What does its study give?

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  17. What is a band spectrum? What does its study give?

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  18. What are Fraunhoffer lines? Explain their origin.

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  19. What is a total solar eclipse?

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  20. White light is passed through sodium vapours contained in a thin walle...

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