In a direct vision spectroscope, one uses a flint and a crown glass prism combination to get zero mean deviation but a finite dispersion. Which of the following is an acceptable diagrammatic representation? [C= crown , F= flint, V= violet, R= red ]

Question

In a direct vision spectroscope, one uses a flint and a crown glass prism combination to get zero mean deviation but a finite dispersion. Which of the following is an acceptable diagrammatic representation? [C= crown , F= flint, V= violet, R= red ] (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

In a prism combination for dispersion, without deviation, the yellow ray comes out undeviated. As μV > μR, violet deviates more than red. Since μF > μC ' AF < AC as the condition for no deviation is (μF-1) AF =(μC-1) ⋅ AC

Q. In a direct vision spectroscope, one uses a flint and a crown glass prism combination to get zero mean deviation but a finite dispersion. Which of the following is an acceptable diagrammatic representation? $[C =$ crown $, F =$ flint, $V =$ violet, $R =$ red $]$

In a prism combination for dispersion, without deviation, the yellow ray comes out undeviated. As $μ_{V} > μ_{R}$ , violet deviates more than red. Since $μ_{F} > μ_{C}$ ' $A_{F} < A_{C}$ as the condition for no deviation is $(μ_{F} - 1) A_{F}$ $= (μ_{C} - 1) \cdot A_{C}$

Q. In a direct vision spectroscope, one uses a flint and a crown glass prism combination to get zero mean deviation but a finite dispersion. Which of the following is an acceptable diagrammatic representation? [C= crown ,F= flint, V= violet, R= red ]

In a prism combination for dispersion, without deviation, the yellow ray comes out undeviated. As μV​>μR​, violet deviates more than red. Since μF​>μC​ ' AF​<AC​ as the condition for no deviation is (μF​−1)AF​ =(μC​−1)⋅AC​

Q. In a direct vision spectroscope, one uses a flint and a crown glass prism combination to get zero mean deviation but a finite dispersion. Which of the following is an acceptable diagrammatic representation? $[C =$ crown $, F =$ flint, $V =$ violet, $R =$ red $]$

In a prism combination for dispersion, without deviation, the yellow ray comes out undeviated. As $μ_{V} > μ_{R}$ , violet deviates more than red. Since $μ_{F} > μ_{C}$ ' $A_{F} < A_{C}$ as the condition for no deviation is $(μ_{F} - 1) A_{F}$ $= (μ_{C} - 1) \cdot A_{C}$