Question 152: Ray Optics

Question

A thin prism $P_1$ with an angle $6^{\circ}$ and made of glass of refractive index $1.54$ is combined with another prism $P_2$ made from glass of refractive index $1.72$ to produce dispersion without average deviation. The angle of prism $P_2$ is

Accepted Answer

$$({\mu _1} - 1){A_1} = ({\mu _2} - 1){A_2}$$
$$ \Rightarrow (1.54 - 1)6 = (1.72 - 1){A_2}$$
$${A_2} = \left( {{{0.54} \over {0.72}} 	imes 6} ight) = {{18} \over 4} = \left( {{9 \over 2}} ight) = 4.5^\circ $$

Answer

$4.5^{\circ}$

Answer

$7.8^{\circ}$

Answer

$1.3^{\circ}$

Answer

$6^{\circ}$

Ray Optics

A thin prism P_1 with an angle 6^{\circ} and made of glass of refractive index 1.54 is combined with another prism P_2 made from glass of refractive index 1.72 to produce dispersion without average deviation. The angle of prism P_2 is

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