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A plano-convex lens of focal length 30 c...

A plano-convex lens of focal length 30 cm has its plane surface silvered. An object is placed 40 cm from the lens on the convex side. The distance of the image from the lens is

A

18cm

B

24cm

C

30cm

D

40cm

Text Solution

Verified by Experts

The correct Answer is:
B
`1/F=2/f_(L)=2/30,1/F=1/v-1/u`
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NARAYNA-RAY OPTICS AND OPTICAL INSTRAUMENTS -EXERCISE-2 (C.W)(REFRACTION THROUGH SPHERICAL SURFACES )
  1. An object is placed first at infinity and then at 20 cm from the objec...

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  2. The image of a square hole in a screen illuminated by light is obtaine...

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  3. A plano-convex lens of focal length 30 cm has its plane surface silver...

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  4. The graph shows the variation of magnifictaion y'-. m produced by conv...

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  5. A convex lens of focal length f is placed somewhere in between an obje...

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  6. The distance between an object and the screen is 100cm. A lens produce...

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  7. Three lenses in contact have a combined focal length of 12 cm. When th...

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  8. Arrange the following combinations in the increasing order of focal le...

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  9. A thin converging lens forms the real image of certain real object mag...

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  10. When an object is at distances x and y from a lens, a real image and a...

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  11. Two thin convex lenses of focal lengths f(1) and f(2) are arranged coa...

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  12. A plano-convex lens, when silvered at its plane surface is equivalent ...

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  13. A thin equiconvex lens has focal length 10 cm and refractive index 1.5...

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  14. Four lenses are made from the same type of glass, the radius of curvat...

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  15. 4 A thin liquid convex lens is formed in glass. Refractive index of li...

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  16. A thin converging lens of refractive index 1.5 has a focal power of 5 ...

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

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  18. v22

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  19. A plano convex lens has a thickness of 6cm. Its radius of curvature is...

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  20. Two plano-concave lenses of glass of refractive index 1.5 have radii ...

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