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A point object is placed at a distance o...

A point object is placed at a distance of 15 cm from a convex lens. The image is formed on the other side at a distance of 30 cm from the lens. When a concave lens is placed in contact with the convex lens, the image shifts away further by 30 cm. Calculate the focal lengths of the two lenses.

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The correct Answer is:
`10cm` for convex lens and `60 cm` for concave lens
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RESONANCE ENGLISH-GEOMATRICAL OPTICS -Exercise-1
  1. An object of height 1cm is set at angles to the optical axis of a dou...

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  2. A lens placed between a candle and a fixed screen forms a real tr...

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  3. A pin of length 1cm lies along the principle axis of a converging len...

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  4. The radius of the sun is 0.75xx10^(8)m and its distance from the eart...

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  5. A 5.0 diopter lens forms a virtual image which is 4 times the object p...

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  6. A diverging lens of focal length 20 cm and a converging mirror of foca...

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  7. A converging lens and a diverging mirror are placed at a separation of...

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  8. A point object is placed on the principal axis of a convex lens (f = 1...

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  9. A convex lens of focal length 20 cm and a concave lens of focal length...

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  10. Two identical thin converging lenses brought in contact so that thei...

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  11. A point object is placed at a distance of 15 cm from a convex lens. Th...

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  12. The convex surface of a thin concave-convex lens of glass of refractiv...

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  13. A certain material has refractive indices 1.56, 1.60 and 1.68 for red,...

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  14. A flint glass prism and a crown glass prism are to be combined in such...

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  15. Three thin prisms are combined as shown in figure. The refractive indi...

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  16. The focal lengths of a convex lens for red, yellow and violet rays are...

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  17. A thin prism of angle 6.0^@, omega'=0.07 and muy'=1.50 is combined wit...

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  18. A small telescope has an objective lens of focal length 144 cm and an ...

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  19. An angular magnification (magnifying power) of 30 X is desired using a...

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  20. A compound microscope has an objective of focal length 2.0 cm and an e...

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