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The focal length of a lens depends on...

The focal length of a lens depends on

A

radii of curvatures of two surface only.

B

refaractive index of the lens material only.

C

length of the lense.

D

both radii of curvature of two surfaces and refractive index of the lens material.

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The correct Answer is:
D
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TARGET PUBLICATION-RAY OPTICS-EVALUATION TEST
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  2. When image is fomred by reflaction, the field of veiw is maximum for

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  3. A candle flame 2 cm high is placed at distance of 2 meter from a wall....

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  4. An infinitely long rod lies along the axis of a concave mirror of foca...

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  5. Assertion : If objective and eye lens of a mcroscope are interchanged ...

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  6. The convex surface of a thin concavo-convex lens of glass of refractiv...

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  7. Focal length of a convex/ concave mirror depends on

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  8. A convex lens focal lenghts 30 cm made of glass of refractive index 1....

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  9. Magnifying power of a telescope in normal adjustment when final images...

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  10. Two plano-concave lenses (1 and 2) of glass of refractive index 1.5 ha...

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  11. Assertion : If radius of curvature of mirror is doubled, focal length ...

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  12. An experiment needs to heat a small sample to 700 K, but the only avai...

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  13. Assertion : A dentist uses a convex mirror to examine a small cavity i...

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  14. A man with normal near- point (25c m) reads a book with small print us...

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  15. For a given compound microscope, increase in length of tube

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  16. Which of the following (referred to a spherical mirror) do (does) not ...

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  17. Assertion : A single lens produces a coloured image of an object illum...

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