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 < f_r

        (d)    f_v > f_r

Question

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 < f r (d) f v > f r

Navjyot Kalra · Answer

(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. (f r > f v )

Jatin · Answer

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

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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 f_v, f_g, f_r, We will get

        (a)    f_v = fg

(b)    f_g > f_r

        (c)    f_v < f_r

        (d)    f_v > f_r

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