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The focal length of a thin biconvex lens...

The focal length of a thin biconvex lens is `20 cm`. When an object is moved from a distance of `25 cm` in front of it to `50 cm`, the magni-fication of its image changes from `m_(25) to m_(50)`. The ratio `(m_(25))/(m_(50))` is.

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MOTION-GEOMETRICAL OPTICS-Exercise - 4 | Level-II
  1. A student performed the experiment of determination of focal length of...

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  2. A ray OP of monochromatic light is incident on the face AB of prism AB...

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  3. The focal length of a thin biconvex lens is 20 cm. When an object is m...

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  4. A biconvex lens of focal length 15 cm is in front of a plane mirror. T...

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  5. A large glass slabe (mu=5//3) of thickness 8cm is placed over a point ...

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  6. Image of an object approaching a convex mirror of radius of curvature ...

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  7. Two transparent media of refractive indices mu(1) and mu(3) have a sol...

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  8. An initially parallel cylindrical beam travels in a medium of refracti...

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  9. An initially parallel cylindrical beam travels in a medium of refracti...

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  10. The speed of light in the medium is

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  11. A light ray travelling in glass medium is incident of glass- air inter...

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  12. Water (with refractive index = 4/3) in a tank is 18 cm deep. Oil of re...

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  13. A bi-convex lens is formed with two thin plano-convex lenses as shown ...

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  14. Most materials have the refractive index, n gt 1. So, when a light ray...

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  15. Most materials have the refractive index, n gt 1. So, when a light ray...

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  16. The image of an object, forme by a plano-convex lens at a distance of ...

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  17. A ray of light travelling in the direction (1)/(2)(hat(i)+sqrt(3)hat(j...

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  18. A right angled prism of refractive index mu(1) is placed in a rectangu...

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  19. A point source S is placed at the bottom of a tranparent block of heig...

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  20. Four combinations of two thin lenses are given in List I. The radius o...

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