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An object is placed 1m in front of the c...

An object is placed 1m in front of the curved surface of a plano-convex lens whose plane surface is silvered. A real image is formed in front of the lens at a distance of 120cm. Then, the focal length of the lens is

A

100 cm

B

200 cm

C

150 cm

D

300 cm

Text Solution

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The correct Answer is:
B
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AAKASH INSTITUTE ENGLISH-RAY OPTICS AND OPTICAL INSTRUMENTS-Assignment (Section - B) Objective Type Questions (One option is correct)
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  2. For an eye kept at a depth h inside water is refractive index mu, and ...

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  3. A convex lens A of focal length 20cm and a concave lens B of focal len...

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  4. An equilateral triangular prism is made of glass (mu = 1.5). A ray of ...

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  5. White light is incident on the interface of glass and air as shown in ...

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  6. In a spherical paper weight (R = 10 cm) made of glass of refractive in...

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  7. A concave mirror is placed on a horizontal table with its axis directe...

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  8. Two prisms of same glass (mu = sqrt(2)) are stuck together without gap...

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  9. A short linear object of length b lies along the axis of a concave mir...

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  10. An object is placed 1m in front of the curved surface of a plano-conve...

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  11. Figure shows a torch sending a parallel beam of light fixed on a wall ...

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  12. A ray of light passes from vaccum into a medium of refractive index n....

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  13. A plane mirror is placed horizontally inside water (mu=4/3). A ray fal...

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  14. A thin lens focal length f and its aperture has diameter d. It forms a...

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  15. A tank contains a transparent liquid of refractive index mu. The botto...

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