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10th Class Science Light - Reflection and Refraction Question Bank Light

  • question_answer
    A ray of light is incident normally on one of the faces of a prism of apex angle \[30{}^\circ \] and refractive index \[\sqrt{2}\]. The angle of deviation of the ray is

    A)  zero                     

    B)        \[90{}^\circ \]

    C) \[15{}^\circ \]  

    D)        \[45{}^\circ \]

    Correct Answer: C

    Solution :

     Here,    \[i=0,\,\,A={{30}^{o}}\] Now\[\mu =\frac{\sin e}{\sin {{r}_{2}}}=\frac{\sin e}{\sin A}\](since\[A=0\,\,{{r}_{2}}\]) \[\therefore \]  \[e={{45}^{o}}\] \[\therefore \]  \[\delta =i+e-A=0+{{45}^{o}}-{{30}^{o}}\mathbf{=1}{{\mathbf{5}}^{\mathbf{o}}}\]


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