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When does a convex lens behave as a conc...

When does a convex lens behave as a concave lens ?

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When the convex lens is held in a transparent medium of refractive index greater than the refractive index of lens material, it would behave as a concave lens.
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What is the sign of the power of (i) a convex lens (ii) a concave lens ?

State two differences between a convex lens and a concave lens. Give one use of convex lens and one of concave lens.

Calculate the position of the image of an object when placed at (a) focus of a convex lens. (b) focus of a concave lens.

Assertion:A convex lens and a concave lens are kept in contact. They will behave as a diverging lens if focal length of convex lens is more. Reason: Power of a concave lens is always less than the power of a convex lens, as power of concave lens is negative whereas power of convex lens is positive.

PRADEEP-RAY OPTICS-Conceptual problem(b)
  1. Can the relative refractive index of a medium w.r.t. another medium be...

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  2. Can the absolute value of refractive index of a medium be less than un...

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  3. When light comes from air to glass, the refracted ray is bent towards ...

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  4. If a plane glass slab is placed on letters of different colours, then ...

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  5. The critical angle for glass air interface is C and for glass water in...

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  6. Why does a diamond shine ?

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  7. Explain why (a) A diamond glitters in a brightly lit room, but not i...

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  8. Path of ray of light passing through three liquids of refractive indic...

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  9. A ray of light after refraction through a concave lens becomes paralle...

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  10. The surfaces of the sun glasses (goggles) are curved, yet their power ...

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  11. Calculate the position of the image of an object when placed at (a) ...

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  12. A concave lens made of a material of refractive index n1 is kept in a ...

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  13. Following data was recorded for values of object distance and the corr...

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  14. A thin lens focal length f(1) and its aperture has diameter d. It form...

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  15. When does a convex lens behave as a concave lens ?

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  16. A lens immersed in a transparent liquid becomes invisible. Under what ...

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  17. A lens is forming the image of an object on its axis. If the lens is p...

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  18. What happens to focal length of a convex lens when it is immersed in w...

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  19. The radii of curvature of both the surfaces of a lens are equal. How w...

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  20. A convex lens of refractive index mug is held in a reansparent medium ...

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