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An astronomical telescope has an objecti...

An astronomical telescope has an objective of focal length 20 cm and an eyepiece of focal length 4.0 cm. The telescope is focused to see an object 10 Km from the objective .The final image is formed at infinity. Find the length of the tube and the angular magnification produced by the telescope.

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RESONANCE ENGLISH-GEOMATRICAL OPTICS -Exercise-3
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  2. (a) (i) Draw a labelled ray diagram to show the formation of image in ...

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  3. (a) Draw the ray diagram showing the geometry of formation of the imag...

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  4. The image obtained with a convex lens is erect and its length is 4 tim...

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  5. A converging lens is kept coaxially in contact with a diverging lens -...

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  6. Draw a ray diagram to show the working of a compound microscope. Deduc...

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  7. An astronomical telescope has an objective of focal length 20 cm and a...

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  8. A convex lens made up of glass of refractive index 1.5 is dipped, in t...

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  9. Use the mirror equation to deduct that : (a) an object between f and...

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  10. A gaint refracting telescope at an observatory has an objective lens o...

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  11. A beam of light converges at a point P. Now a lens is placed in the pa...

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  12. For the same value of angle of incidence, the angles of refraction in ...

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  13. Define magnifying power of a telescope. Write its expression. A smal...

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  14. An object AB is kept in front of a concave mirror as shown in the figu...

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  15. You are given three lenses L(1),L(2) and L(3) each of focal length 20 ...

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  16. Describe a reflecting type telescope. What are its advantage over the ...

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  17. Which type of lens is used to correct astigmatisum ?

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  18. A biconcave lens made of a transparent material of refractive index 1...

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  19. Two monochromatic ray of light are incident normally on the face AB of...

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  20. A convex lens of focal length 20cm is placed coaxilly with a convex mi...

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