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Two plane mirrors are inclined at 70^@. ...

Two plane mirrors are inclined at `70^@`. A ray incident on one mirror at incidence angle `theta` after reflection falls on the second mirror and is reflected from there parallel to the first mirror, The value of `theta` is

A

`50^@`

B

`45^@`

C

`30^@`

D

`55^@`

Text Solution

Verified by Experts

The correct Answer is:
A

Refer to diagram in triangle ABC,
`70^@+70^@+90^@-theta=180^@`
`theta=50^@`
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CP SINGH-REFLECTION OF LIGHT-EXERCISES
  1. A ray reflected successively from two plane mirrors incline at a certa...

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  2. Two plane mirrors are placed perpendicular to each other. A ray strike...

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  3. Two plane mirrors are inclined at 70^@. A ray incident on one mirror a...

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  4. A ray of light makes an angle of 10^@ with the horizontal and strikes ...

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  5. A plane mirrorr makes an angle of 30^(@) with horizontal. If a vertica...

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  6. Figure shows two plane mirrors and an object O placed between them wha...

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  7. A point object is placed midway between two plane mirrors a distance a...

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  8. An observer moves towards a plane mirror with a speed of 2(m)/(sec). T...

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  9. A room (cubical) is made of mirros. An insect is moving along the diag...

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  10. If an object moves towards a plane mirror with a speed v at an angle t...

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  11. A small plane mirror placed at the centre of a spherical screen of rad...

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  12. A ray of light is incident on the plane mirror at rest the mirror star...

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  13. A point source of light B is placed at a distance L in front of the ce...

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  14. Two plane mirrors A and B are aligned parallel to each other, as shown...

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  15. All the following statements are correct except (for real objects)

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  16. Mark the correct Option:

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  17. In image formatiion from spherical mirrors, only paraxial rays are con...

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  18. Which of the following (referred to a sphericla mirror) do (does) not ...

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  19. Check the wrong statement (s), if object is real (i) A concave mirro...

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  20. A convex mirror is used to form an image of a real object. The image ...

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