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A concavo-convex lens is made of glass o...

A concavo-convex lens is made of glass of refractive index `1.5.` The radii of curvature of its two surfaces are `30 cm` and `50 cm.` Its focal length when placed in a liquid of refractive index `1.4` is

A

`200 cm`

B

`500 cm`

C

`800 cm`

D

`1050 cm`

Text Solution

Verified by Experts

The correct Answer is:
D
`1/f=(1.5/1.4-1)(1/(-30)-1/(-50))`
`:.f=-1050 cm`
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DC PANDEY-REFRACTION OF LIGHT-Level 1 Objective
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  2. A prism of refractive index sqrt2 has refractive angle 60^@. In the or...

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  3. The focal length of a combination of two lenses is doubled if the sep...

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  4. A convexo-concave convergent lens is made of glass of refractive index...

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  5. An optical system consists of a thin convex lens of focal length 30 cm...

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  6. In the figure shown, the angle made by the light ray with the normal i...

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  7. For refraction through a small angled prism, the angle of minimum devi...

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

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  9. A thin convex lens of focal length 30 cm is placed in front of a plane...

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  10. One side of a glass slab is silvered as shown in the figure. A ray of ...

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  11. A prism has refractive index sqrt((3)/(2)) and refractive angle 90^@. ...

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  12. In figure, an air lens of radius of curvature of each surface equal to...

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  14. An object, a convex lens of focal length 20 cm and a plane mirror are ...

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  15. The prism shown in figure has a refractive index of 1.60 and the angle...

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  16. A prism having refractive index sqrt2 and refractive angle 30^@ has on...

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  17. The image for the converging beam after refraction through the curved ...

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  18. A concavo-convex lens is made of glass of refractive index 1.5. The ra...

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  19. From the figure shown, establish a relation between mu1,mu2,and mu3

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  20. When light of wavelength lambda on an equilateral prism, kept on its m...

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