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In the mirror formula, (1)/(f)=(1)/(v)+1...

In the mirror formula, `(1)/(f)=(1)/(v)+1/u,f` does not change when u is changed.

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When u is changed, v changes but f remains constant. This is because f depends only on radius of curvature of the mirror.
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What is f in mirror formula (1)/(u)+(1)/(v)=(1)/(f) ?

The focal length of a less is given by the formula (1)/(f)=(1)/(u)+(1)/(v) . Make f as the subject of the formula. if u=20cm and v=30, then find f. The following steps are involved in solving the above problem. Arrange them in sequential order. (A) Given (1)/(f)=(1)/(u)+(1)/(v) (B) rArr f=(uv)/(u+v) (C) f=(20xx30)/(20+30)=(600)/(50)=12 cm. (D) rArr (1)/(f)=(v+u)/(uv)

State mirror formula. How does 'f' change when object distance 'u' from the mirror is changed?

Assertion:- The formula ((1)/(4)+(1)/(u)=(1)/(f)) connecting u and v for a spherical mirror is valid only for mirros whose sizes are very small compared to their radii of curvatures. Reason:- Laws of reflection are strictly valid for smaller size of of optical system.

The mirror formula is given by 1/v+1/u=1/f where the symbols have their usual meanings. Then the lens formula is given by

PRADEEP-REFLECTION AND REFRACTION-Additional Question
  1. A ray of light passing through centre of curvature of a spherical mir...

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  2. A concave mirror is used as doctor's head mirror.

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  3. In the mirror formula, (1)/(f)=(1)/(v)+1/u,f does not change when u is...

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  4. Where should an object be placed so that a real and inverted image of ...

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  5. An object 2 cm high is placed at a distance 2 f from a convex lens. Wh...

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  6. What is the largest value of refractive index? Name the medium.

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  7. (a) A ray of light in air enters glass. Does it bend towards normal ? ...

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  8. (a) A water tank appears 1*5 m deep. What is it actual depth ? Given r...

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  9. (a) What is the speed of light in water of refractive index 4//3? (b...

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  10. (a) Can you measure rough focal length of a convex lens? If yes, why? ...

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  11. (a) The linear magnification of a concave lens is always positive. Why...

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  12. What is the unit of refractive index?

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  13. (i) Rohit claims to have obtained an image twice the size of the objec...

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  14. Arrange air, glass and water in terms of decreasing refractive index.

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  15. Which is denser optically out of alcohol with n=1*36 and carbon disulp...

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  16. The image formed by a convex lens is always real. Is it true?

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  17. a convex lens forms a virtual image of an object. What is the position...

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  18. For what position of an object a real, diminshed image is formed by a ...

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  19. Where should an object be placed in order of to use a convex lens as a...

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  20. What is the difference between lens formula and mirror formula?

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