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If two mirrors are kept at 60^@ to each ...

If two mirrors are kept at `60^@` to each other, then the number of images formed by them is ......

A

5

B

6

C

7

D

8

Text Solution

Verified by Experts

The correct Answer is:
A
The formula for the number of images formed by two inclined mirrors, inclined at angle `theta` is
`N = (360)/(theta) -1`
If `(360)/(theta)` = even whereas `N = (360)/(theta) "If" (360)/(theta)` = odd
For `theta = 60^(@) , N = (360)/(60) = 6 `
Hence , N = 6-1 = 5
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ALLEN -GEOMETRICAL OPTICS-EXERCISE-05 (A)
  1. If two mirrors are kept at 60^@ to each other, then the number of imag...

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  2. Wavelength of light used in an optical instrument are lambda(1) = 4000...

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  3. Which of the following is used in optical fibres ?

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  4. Large aperture of telescope are used for

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  5. The image formed by an objective of a telescope is-

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  6. To get three images of a single object, one should have two plane mirr...

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  7. A light ray is incident perpendicular to one face of a 90^@ prism and ...

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  8. A plano convex lens of refractive index 1.5 and radius of curvature 30...

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  9. A fish looking up through the water sees the outside world, contained ...

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  10. Two point white dots are 1 mm apart on a black paper. They are viewed ...

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  11. A thin glass (refractive index 1.5) lens has optical power of - 5D in ...

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  12. The refractive index of glass is 1.520 for red light and 1.525 for blu...

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  13. Two lenses of power - 15D and + 5D are in contact with each other. The...

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  14. A student measures the focal length of a convex lens by putting an obj...

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  15. The refractive index of transparent cylindrical rod is (2)/(root3) . A...

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  16. Let the x-z plane be the boundary between two transparent media. Mediu...

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  17. A car is fitted with a convex side-view mirror of focal length 20 cm. ...

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  18. When monochromatic red light is used instead of blue light in a convex...

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  19. A beaker contains water up to a height h(1) and kerosene of height h(2...

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  20. An object 2.4 m in front of a lens forms a sharp image on a film 12 cm...

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