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What is the angle of incidence of a ray ...

What is the angle of incidence of a ray if the reflected ray is at an angle of `90^(@)` to the incident ray?

Text Solution

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The angle of incidence ray will be `45^@`
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A ray of light passes from a denser medium to a rarer medium at an angle of incidence i. The reflected and refracted rays make an angle of 90^@ with each other. The angle of reflection and refraction are resepectively r and r'. The critical angle is given by :

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Knowledge Check

  • A ray of light from a denser medium strikes a rarer medium at an angle of incidence I (see figure ). The reflected and refracted rays make an angle of 90^(@) with each other. The angles of reflection and refraction are r and r^() . The critical angle is

    A
    `sin^(-1)(tanr)`
    B
    `sin^(-1)(tani)`
    C
    `sin^(-1)(tanr^('))`
    D
    `tan^(-1)(sini)`

  • A ray of light falls on a plane mirror. When the mirror is turned, about an axis at right angles to the plane of mirror by 20^(@) the angle between the incident ray and new reflected ray is 45^(@) . The angle between the incident ray and original reflected ray was therefore.

    A
    `35^ (@)` or `50^ (@)`
    B
    `25^(@)` or `65^(@)`
    C
    `45^(@)` or `5^(@)`
    D
    None of these

  • If the angle of incidence of a ray is 15^@ , then what will be the angle of reflection?

    A
    `60^@`
    B
    `45^@`
    C
    `30^@`
    D
    `15^@`

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    Light of wavelength 5000 Å falls on a plane reflecting surface. What are the wavelength and frequency of the reflected light ? For what angle of incidence is the reflected ray normal to the incident ray ?

    If the angle between incident ray and reflected ray is 120^(@) , what is the angle of incidence ?

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    For which angle of incidence reflected ray is completely polarised?

    A ray of light falls on a plane mirror. When the mirror is turned, about an axis at right angle to the plane of the mirror through 20^(@) , the angle between the incident ray and new reflected ray is 45^(@) . Find the angle between the incident ray and original reflected ray

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