A) \[{{10}^{3}}\]
B) 0.80
C) 0.40
D) 0.20
Correct Answer: C
Solution :
The refractive index of the material of a lens varies slightly with the wavelength and hence, the focal length is also different for different wavelengths. The separation between the images formed by extreme wavelengths of visible range is called the longitudinal chromatic given by \[{{f}_{1}}-{{f}_{2}}=\omega \times f\] where,\[\omega \] is dispersive power. Given, \[\omega =0.02,f=20\] \[\therefore \] \[{{f}_{1}}-{{f}_{2}}=0.02\times 20=0.40\]
You need to login to perform this action.
You will be redirected in
3 sec
