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Two plano-convex lens of glass of refrac...

Two plano-convex lens of glass of refractive index 1.5 have radii of curvature 20cm and 30cm. They are placed in contact with curved surface towards each other and the space between them is filled with a liquid of refractive index `4/3`. Find the focal length of the system.

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`-72 cm`
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AAKASH SERIES-RAY OPTICS-PROBLEMS ( LEVEL-II)
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  2. A convex glass lens ( mu = 1.5 ) produces a real image of an object. ...

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  3. Two plano-convex lens of glass of refractive index 1.5 have radii of c...

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  4. A rectangulat block of refractive index mu is placed on a printed page...

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  5. A ray is incident on prism at an angle i with normal. When it comes ou...

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  6. The dispersive power of crown and flint glasses are 0.02 and 0.04 resp...

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  7. Two prisms of identical geometrical shape are combined with their refr...

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  8. A thin prism of crown glass (mur=1.515, muv=1.525) and a thin prism o...

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  9. Two small angled prisms A and B deviate the blue rays by 7^@ and 9^@ a...

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  10. A beam of light converges towards a point O, behind a convex mirror of...

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  11. When an object is placed at a distance of 25 cm from a mirror, the mag...

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  12. An object is placed between a plane mirror and a convex mirror as show...

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  13. A plane mirror and a concave mirror are arranged as shown in figure an...

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  14. Describe the image in convex mirror, of the image of rod PQ in the pla...

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  15. The u-v curve in a concave mirror as shown in figure. Find the f...

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  16. An illuminated point object O is kept 20 cm from a thin convex lens L(...

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  17. A thief is running away in a car with velocity of 20 m/s . A police je...

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  18. One face of a rectangular glass plate of 8 cm thickness is silvered. A...

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  19. The bottom of water tank is lined with a plane mirror.A particle is pr...

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  20. In figure a point source S is placed at a height h above the plane mir...

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