প্রতিসরনাংক সংক্রান্ত

A narrow beam of light is incident at 5353^{\circ} angle made with normal on a glass plate of refractive index 1.61.6. If the thickness of the plate is 20  mm20\;mm. Calculate the shift of the beam.  

হানি নাটস

Given,

Angle of incidence, i=53oi = 53^o

Refractive index, μ=1.6\mu = 1.6

Thickness, t=20mmt = 20mm

from snell's law,

μ=sinisinr\mu = \dfrac{\sin i}{\sin r}

1.6=sin53osinr1.6 =\dfrac{\sin 53^o}{\sin r}

sinr=sin53o1.6\Rightarrow \sin r = \dfrac{\sin 53^o}{1.6}

r=30or=30^o

Lateral shift, Ls=isin(ir)cosrL_s = \dfrac{i \sin (i-r)}{\cos r}

=20sin23ocos30o = 20 \dfrac{\sin 23^o}{\cos 30^o}


Ls=9.02mmL_s = 9.02mm

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