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Find the position of an object which whe...

Find the position of an object which when placed in front of a concave mirror of focal length 20cm, produces a virtual image, which is twice the size of the object.

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BINA LIBRARY-Optics-I-EXERCISE
  1. What is the best position for eye viewing an object through microscope...

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  2. Define beam of light.

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  3. Find the position of an object which when placed in front of a concave...

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  4. When an object is placed at a distance of 60 cm from a convex mirror, ...

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  5. An object is kept at 0.2 m from a convex lens of focal length 0.15 m. ...

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  6. A double convex lens made of glass of refractive index 1.5 has both ra...

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  7. Calculate the focal length of the combination of a convex lens of foca...

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  8. A converging lens has focal length of 20 cm in air. It is made of a ma...

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  9. Two lenses of powers, 15D and +5D are in contact with each other formi...

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  10. The refractive index of a prism of angle 60 degree is 1.62 for sodium ...

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  11. A ray of light incident on an equilateral glass prism shows minimum de...

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  12. A ray of light passes through an equilateral prism such that the angle...

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  13. An astronomical telescope of magnifying power 10 consists of two thin ...

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  14. A near point of hypermetropic person is 50 cm from the eye. What is th...

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  15. An astronomical telescope uses two lenses of powers 10 dioptre and 1 d...

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  16. The focal length of a convex lens of R.I. 1.5 in air is 2 cm. The foca...

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  17. Time taken by sunlight to pass through a window of thickness 4 mm whos...

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  18. Radius of curvature of a convex mirror is 40 cm and the size of the ob...

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  19. A convex lens has a focal length f. It is cut into two parts along a l...

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  20. Two thin lenses of focal lengths f1, and f2 are placed co-axially in ...

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