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The focal length of converging lens is measured for violet, green and red colours. It is respectively f v , f g , f r , We will get (a) f v = fg (b) f g > f r (c) f v r (d) f v > f r



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


Grade:10

2 Answers

Navjyot Kalra
askIITians Faculty 654 Points
7 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
15 Points
one year ago
Fv>fg
Bcz f is inversely proportional to lemda
We know wavelength of red is max
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