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

Question

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 < fr  (B) fg> fr  (C) fv = fg  (D) fg > fr

Tardigrade Admin · Accepted Answer

(1/f) = (μ -1) ( (1/R1) - (1/f2 ) ) 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 , fv < fr

Q. 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

$f_{v} < f_{r}$

$f_{g} > f_{r}$

$f_{v} = f_{g}$

$f_{g} > f_{r}$

$\frac{1}{f} = (μ - 1) (\frac{1}{R _{1}} - \frac{1}{f _{2}})$
Since the refractive index of violet colour $(μ_{v})$ is
greater than the refractive index of red colour, $(μ_{r})$
therefore focal length of violet colour is less than
the focal length of red colour or in other words ,
$f_{v} < f_{r}$

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

fv​<fr​

fg​>fr​

fv​=fg​

fg​>fr​

f1​=(μ−1)(R1​1​−f2​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 , fv​<fr​

Q. 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

$f_{v} < f_{r}$

$f_{g} > f_{r}$

$f_{v} = f_{g}$

$f_{g} > f_{r}$