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A beam of parallel rays is brought to f...

A beam of parallel rays is brought to focus by a plano-convex lens.A thin concave lens of same focal length is joined to the first lens .The effect of this is that

A

the focal point shifts away from the lens by a small distance

B

the focus shifts to infinity

C

the focus remains undistruubed

D

the focus moves sidewards.

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MODERN PUBLICATION-UNIT TEST -06-EXERCISE
  1. The plane face of the plano-convex lens of focal length 20 cm is silve...

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  2. A lens having focal length f and aperture of diameter d//2 in the cent...

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  3. A beam of parallel rays is brought to focus by a plano-convex lens.A ...

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  4. Large aperture of lens results in

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  5. The spherical abberation in a lens may be inimised by designing of th...

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  6. A glass prism placed in a homogeneous transparent medium will deivatie...

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  7. Angle of minimum deviation for a prism of refractive index 1.5 is equa...

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  8. Yellow light is refracted through a prism producing minimum deviation ...

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  9. The figures represent three cases of ray passing through a prism of re...

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  10. The refracting angle of a prism is A and the refractive index of its m...

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  11. A prism splits a beam of white ligth into its seven constituent colour...

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  12. A narrow beam fo white ligth passes throuugh a glass slab havig paral...

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  13. Refractive indices of a prism material for two wavelengths are 1.66 an...

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  14. When a glass prism is placed inside water,its dispersive power

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  15. During dispersion of white light by prism placed in air,

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  16. The figure shows the view through the eye-piece of a prism spectromete...

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  17. One cannot see through fog, because:

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  18. The sky would appear red instead of blue,if

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  19. What is the cause of formation of a rainbow?

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  20. Which fo the following statement is correct? (i)Line spectra is chrara...

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