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The distance between a convex lens and a...

The distance between a convex lens and a plane mirror is 15 cm. The parallel rays incident on the convex lens, after reflection from the mirror, form image at the optical centre of the lens. Draw the ray-diagram and find out the focal length of the lens.

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The correct Answer is:
30 cm
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SL ARORA-RAY OPTICS-Problems For Self Practice
  1. A source of light and a screen are placed 90 cm apart. Where should a ...

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  2. An object is placed at a distance of 1.5 m from a screen and a convex ...

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  3. The distance between a convex lens and a plane mirror is 15 cm. The pa...

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  4. A concave lens focal length 10 cm is placed on the axis of concave mir...

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  5. A concave lens is placed in the path of convergent rays. The rays are ...

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  6. A needle 10 cm long is placed along the axis of a convex lens of focal...

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  7. When a slide is placed 15 cm behind the lens in a projector, an image ...

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  8. In the diagram shows below rays are coming from infinity and after pas...

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  9. In the following ray diagram are given the position of an object O, im...

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  10. In the following diagram are shown the position of an object O, image ...

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  11. A compound lens has been formed by joinined a convex and a concave len...

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  12. Two thin lenses of power + 3 D and - 1 D are held contact with each ot...

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  13. A what distance must an object be placed from convex lens of power 4D ...

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  14. Find the focal length and power of a convex lens, which when placed in...

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  15. The power of a thin convex lens of glass is 5 dioptre. When it is imme...

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  16. A concave lens is kept in contact with a convex lens of focal length 2...

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  17. A compound lens is made of two lenses having powers +15.5 D and -5.5D....

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  18. Ray coming from an object situated at infinity, fall on a convex lens ...

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  19. A ray of light is incident at an angle of 60^(@) on one face of a pris...

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  20. The refracting angle of a glass prism is 60^(@). The value of minium d...

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