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What is astigmatism ? How can it be remo...

What is astigmatism ? How can it be removed ?

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MODERN PUBLICATION-RAY OPTICS AND OPTICAL INSTRUMENTS-Revision Exercises (Short Answer Questions)
  1. Two monochromatic rays of light are incident normally on the face AB o...

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  2. Obtain an expression for the combined focal length for two thin convex...

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  3. लेंस समीकरण (1)/(v) -(1)/(u) =(1)/(f) की सहायता से दर्शाइए कि अवतल ल...

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  4. A ray of light falling at an angle of 50^@ is refracted through a pris...

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  5. How does angle of deviation vary with the angle of incidence in case o...

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  6. Sky appears blue in colour. Explain.

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  7. Why does the sun appear red at sunset ?

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  8. Why does the Sun visible before the actual sunrise and sunset look red...

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  9. Why is there no dispersion of light refracted through a rectangular gl...

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  10. Eye is more sensitive to yellow colour but danger signals are made wit...

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  11. A convex lens of focal length 20 cm and a concave lens of focal length...

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  12. What is hypermetropia (far-sightedness) ? What are its causes ? How ca...

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  13. Calculate the radius of the curvature an equi-concave lens refrective ...

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  14. An equilateral glass prism has a refrective index 1.6 in air. Calculat...

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  15. What is astigmatism ? How can it be removed ?

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  16. Draw a ray diagram for the formation of image by a compound microscope...

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  17. Objective of a compound microscope should have small focal length. Why...

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  18. Draw a schematic ray diagram of reflecting telescope showing how...

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  19. अपवर्ती दूरदर्शी का नामांकित किरण आरेख खीचिए | इसकी आवर्धन क्षमता को प...

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  20. (a) Show using a proper diagram how unpolarised light can be linearly...

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