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

(a) fv = fg

(b) fg > fr

(c) fv < fr

(d) fv > fr

Hrishant Goswami , 11 Years ago
Grade 10
anser 2 Answers
Navjyot Kalra

Last Activity: 11 Years ago

(c)

According to Cauchy relation

.''. Red light has wavelength greater than violet light.

Therefore focal length of lens for red is greater than for violet.

(fr >  fv)

 

Jatin

Last Activity: 5 Years ago

Fv>fg
Bcz f is inversely proportional to lemda
We know wavelength of red is max
..............................................

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