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The focal length of an equiconvex lens p...

The focal length of an equiconvex lens placed in air is equal to radius of curvature of either surface. Is it true ?

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yes, `f = R` only when `mu = 1.5`. This follows from
`(1)/(f)=(mu - 1)((1)/(R_1) - (1)/(R_2)). If mu ne 1.5`, then `f ne R`.
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PRADEEP-RAY OPTICS-Short Answer(b)
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  2. Where should an object be placed from a convex lens to from an image o...

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  3. The focal length of an equiconvex lens placed in air is equal to radiu...

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  4. Within a glass slab, a double convex air bubble is formed. How would t...

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  5. Why does a convex lens of glass mu = 1.5 behave as a diverging lens wh...

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  6. A diverging lens of focal length F is cut into two idential parts, eac...

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  7. Draw a plot showing the variation of power of a lens with the wavelen...

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  8. A lens whose radii of curvature are different is forming the image of ...

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  9. The image of a candle is formed by a convex lens on a screen. If the l...

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  10. A convex lens forms the image of the sun at a distance of 10 cm. Where...

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  11. An equiconvex lens of focal length 15 cm is cut into two equal halves ...

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  12. A lens shown in Fig. 6(b).75 is made of two different materials. A poi...

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

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  14. How does focal length of a convex lens change if violet light is used ...

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  15. Two thin lenses of power + 3 D and - 1 D are held contact with each ot...

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  16. In Fig., line AB represents a lens through which course of rays is as ...

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  17. Explain with reason how the power of a diverging lens changes when (...

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  18. A ray of light suffers lateral displacement on passing through a paral...

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  19. Prove that mu = (1)/(sin C)' where C is the critical angle.

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  20. What are optical fibers ? Give three appilications of these fibres.

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