The focal length of a thin convex lens for red and blue rays are $100 c m$ and $96.8 c m$ respectively. The dispersive power of the material of the lens is

0.0325

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0.825

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0.968

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0.98

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Solution

The correct option is C 0.0325
As we know,
$ω = \frac{f_{R} - f_{V}}{f_{y}} = \frac{F_{R} - f_{V}}{\sqrt{f_{V} f_{R}}}$
Putting value of $f_{v}$ and $f_{R}$ we get $ω = 0.0325$

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The focal length of a thin convex lens for red and blue rays are 100 cm and 96.8 cm respectively. The dispersive power of the material of the lens is

The correct option is C 0.0325As we know,ω=fR−fVfy=FR−fV√fVfRPutting value of fv and fR we get ω=0.0325

The focal length of a thin convex lens for red and blue rays are $100 c m$ and $96.8 c m$ respectively. The dispersive power of the material of the lens is

The correct option is C 0.0325
As we know,
$ω = \frac{f_{R} - f_{V}}{f_{y}} = \frac{F_{R} - f_{V}}{\sqrt{f_{V} f_{R}}}$
Putting value of $f_{v}$ and $f_{R}$ we get $ω = 0.0325$