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Explain why convex lenses converge incid...

Explain why convex lenses converge incident beam of light whereas concave lenses diverge light.

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Lenses can be assumed to be made up of a large number of prisms. Light after refraction has a tendency to move towards the base having a larger area. Hence light beam converges inside a convex lens and diverges inside a concave lens.
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SUBHASH PUBLICATION-RAY OPTICS AND OPTICAL INSTRUMENTS-TWO MARKS QUESTIONS WITH ANSWERS
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  2. Why do thick lenses show more chromatic aberration than thin lenses?

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  3. Explain why convex lenses converge incident beam of light whereas conc...

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  6. Define angular magnification.

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  7. Draw a neat labelled diagram of Cassegrain reflecting telescope.

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  9. Answer the following questions: (b) A virtual image, we always say, ...

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  10. Write the formula for the lateral shift and explain the symbols used.

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  11. Write the formula for the normal shift and explain the symbols used.

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  12. Explain why there is an early sunrise or a late sunset.

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  13. Give any two consequences of refraction of light.

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  14. Write any two practical applications of optical fibres.

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  15. What is an optical fibre? Name the principle on which it works.

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  16. Distinguish between a pure and an impure spectrum.

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  17. Define power of a refracting surface. (Define the power of a lens).

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  18. Draw a neat diagram to show dispersion of light in a prism.

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  19. Why vaccum is a non-dispersive medium?

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