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Your are given following three lense. Wh...

Your are given following three lense. Which two lenses will you use as an eyepiece and as an objective to construct as astronomical telescope ?

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Lens `L_(1)` will be taken as the objective lens as its focal length is highest.
Lens `L_(3)` will be taken as eyepiece as its focal length is smallest.
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MODERN PUBLICATION-RAY OPTICS AND OPTICAL INSTRUMENTS-Revision Exercises (Very Short Answer Questions)
  1. When red light passing through a convex lens is replaced by light of b...

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  2. A glass lens of refractive index 1.5 is placed in a trough of liquid. ...

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  3. Your are given following three lense. Which two lenses will you use as...

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  4. Does the critical angle depend on the wavelength of the light ?

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  5. Due to which phenomenon, advanced sunrise and delayed sunset occur ?

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  6. What will be the effect on the power of a glass lens if it is immersed...

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  7. Define one dioptre.

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  8. Find the focal length of a lens having -0.5 D power.

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  9. What is total internal reflection of light ? What are conditions for t...

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  10. What are optical fibres ? What is the principle on which optical fibre...

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  11. What is the main requirement in fabricating optical fibres ?

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  12. What are para-axial rays and marginal rays ?

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  13. Under what condition will the object and image always be on the same s...

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  14. An image of an object is formed by using a convex lens. If the orienta...

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  15. What is focal length and power of a rectangular glass slab ?

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  16. Two convex lenses of focal length 10 cm each are combined. What will b...

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  17. Speed of light in glass is 2 xx 10^8 m//s. Refractive index of glass i...

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  18. What do you mean by angle of prism ?

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  19. List the factors on which the angle of deviation through a prism depen...

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  20. Which colour deviates (i) most (ii) least on passing through a prism ?

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