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A convex lens of focal length 20 cm is p...

A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 10 cm. What is the focal length and power of the combination ?

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MODERN PUBLICATION-RAY OPTICS AND OPTICAL INSTRUMENTS-Revision Exercises (Long Answer Questions)
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  2. पार्थिव दूरदर्शी का रेखाचित्र खींचकर उसकी आवर्धन क्षमता के लिए सूत्र क...

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  4. Discuss refraction from denser to rerer medium at a convex spherical r...

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  6. The diagram shows a spherical surface which separates two media of ref...

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  7. (a) For a ray of light travelling from a denser medium of refractive ...

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  8. A converging lens has a focal length of 50mm. What is the power of the...

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  9. Derive lens maker's formula for a thin convex lens.

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  10. A double convex lens is made of glass of refractive index 1.55 with bo...

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  11. A convex lens of focal length 20 cm is placed in contact with a concav...

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  12. A ray of monochromatic light suffers minimum deviation of 38^(@) while...

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  13. Explain the phenomenon of refraction through prism. Derive the followi...

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  14. You are given a prism in which the two refracting surfaces are at 90^(...

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  15. Define dispersion of light. Explain its cause.

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  16. A convex lens made of a glass of refractive index 3//2 has a focal len...

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  17. How will you describe the defects of human eye ? How they are caused a...

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  18. (a) With the help of a labelled ray diagram, explain the construction ...

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  19. Draw a labelled ray diagram of an astronomical telescope in the near p...

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  20. (a) With the help of a suitable ray diagram, derive the mirror formula...

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