Class 12 NEET Physics Optics Questions Part 1

Question : 71 of 100

Marks: +1, -0

The focal length of converging lens is measured for violet, green and red colours. It is respectively fv,fg,fr. We will get

(1997)

fv<fr
fg>fr
fv=fg
fg<fr

Validate

Solution:

=(µ−1)(

−

)
since the refractive index of violet colour (µv) is greater than the refractive index of red colour (µr), therefore focal length of violet colour is less than the focal length of red colour or in other words, $f_{v}

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