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A plano-convex lens of refractive index ...

A plano-convex lens of refractive index 1.5 and radius of curvature 30 cm is silvered at the curved surface. Now, the lens has been used to form the image of an object. What should be the distance of the object from the lense in order to have a real image of the size of the object?

A

20 cm

B

30 cm

C

60 cm

D

10 cm

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The correct Answer is:
A
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AAKASH SERIES-GEOMETRICAL OPTICS-ADDITIONAL PRACTICE EXERCISE -I (LEVEL-I(MAIN) STRAIGHT OBJECTIVE TYPE QUESTIONS)
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  2. The wavelength of light in vacuum is 5000Å when it travels normally th...

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  3. A glass plate has a thicknes t and refractive index mu. The angle of i...

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  4. Wave length of light in denser mediumis 4000Å, it is grazing into a ra...

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  5. A ray of light travels from an optically denser to rarer medium. The c...

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  6. A point source of light is placed at the bottom of a water lake. If th...

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  7. The refractive index of the material ofa double convex lens is 1.5 and...

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  8. A biconvex thin lens is prepared from glass of refractive index mu(2)=...

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  9. A diverging meniscus lens of radii of curvatures 25 cm and 50 cm has a...

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  10. A thin liquid convex lens is formed in glass. Refractive index of liqu...

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  11. The focal lengths of a lens are in the ratio 8:3 when it is immersed i...

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  12. A double convex lens of focal length 30 cm is made of glass. When it ...

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  13. A pin is placed 10cm in front of a convex lens of focal length 20cm, m...

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  14. A convex lens is in contact with a concave lens. The magnitude of the...

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  15. A double convex lens is made of glass which has refractive inded 1.55 ...

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  16. The refractive index of a lens material is 1.5 and focal length f. Du...

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  17. A plano-convex lens of refractive index 1.5 and radius of curvature 30...

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  18. A ray of light is incident at 50^(@) on the middle of one of two mirr...

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  19. A 2.0 cm high object is placed on the principal axis of a concave mirr...

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  20. A concave mirror forms a real image three times larger than the object...

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