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The refractive index of the material of a prism is sqrt2 and the angle of the prism is 30^@. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is |
Answer» SOLUTION : `A=30^@,r_1=30^@,r_2=0^@` `therefore A=r_1+r_2` `30^@=r_1+r_2` `therefore r_1=30^@` From Snell.s law, `n_1sini=n_2sinr_1` (1)SINI=`sqrt2sin30^@` `therefore sini=sqrt2xx1/2` `therefore sini =1/2` `therefore i=45^@` |
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