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Write the uses of concave lens....

Write the uses of concave lens.

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Write the uses of convex lens.

Assertion : Myopia is due to the increase in the converging power of eye lens. Reason : Myopia can be correct with the help of concave lens.

A concave lens is kept in contact with a convex lens of focal length 20 cm. The combination behaves as a convex lens of focal length 50 cm . Find the power of concave lens.

By convention , the power of a convex lens is taken as ………… whereas the power of a concave lens is taken as …………… .

When an object is placed at infinity a __________ is formed at the focus in concave lens.

In a __________ lens , one of the faces of a bi-concave lens is plane.

SURA PUBLICATION-Light-Example
  1. Light travels fastest in vacuum.Why?

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  2. Write the difference between real and virtual image.

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  3. Write the uses of concave lens.

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  4. A convex rear view mirrors is preferred over a plane mirror in a car. ...

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  5. What type of image is formed by a concave mirror?

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  6. Why do we need a shiny surface for reflection?

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  7. The radius of curvature of a spherical mirror is 18 cm What is the for...

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  8. What happens to light when it gets dispersed? Give an example.

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  9. If two mirrors are placed at an inclination of 30^@ then how many imag...

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  10. What is the speed of light in diamond if its refractive index is 2.41?

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  11. A light ray moves from glass (Vglass=2.0xx10^ ms^-1) to diamond (Vdiam...

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  12. Find the refractive index of wather with respect to glass if the refra...

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  13. The speed of light in air is 3xx10^8 ms^-1 and that in wather is 2.25x...

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  14. Differentiate between reguler and irregular reflection.

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  15. Explain the construction and working od kaleidoscope.

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  16. Explain the construction and working of periscope with a labelled diag...

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  17. Explain the uses of periscope.

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  18. Explain the images formed by a concave mirror for different position o...

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  19. Explain some phenomene which occur due to refraction of light in our d...

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  20. Draw the following: Concave mirror

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