Question

10) The wavelength of light plays no role in a) interference b) polarization c) resolving power d) diffraction e) none of these 11) Thin films in soapy water owe their brilliant colors to a combination of interference and a) refraction b) reflection c) polarization d) diffraction e) none of these 12) The wavelength of light that is deviated in the first order by 15 degrees by a 5000-line/cm grating is a) 773nm b) 52nm c)518 nm d) 773 nm e) none of these 13) Longitudinal waves do not exhibit a) diffraction b) refraction c) reflection d) polarization e) none of the above 14) In a double slit experiment the maximum intensity of the bright line on either side of the central one on the screen occurs on the screen at locations where the arriving waves differ in path length by )λ a) A/2 15) If the wavelength of light used to resolve two objects is decreased, the minimum separation of the objects that can be resolved b) c) λ/4 d) 2λ e) none of these a) increases 6) decreases c) remains unchanged d) none of these 16) Four lenses with the focal lengths listed below are being considered for use as the objective lens of a telescope. The one that will produce the greatest magnification with a given eye piece has the focal length c) 2 m d) 4m e) none of these a) -2m b)-4 m

Answer 1

In interference and diffraction, the condition for maximum and minimum depends on wavelength of light. Resolving power is given by R = lambda/delta lambda Where delta lambda in the smallest difference in wavelength that can be resolved. So, Resolving power also depends on wavelength. Polarization depends on nature of the reflecting medium and the wavelength of the medium. So, ans in option(e) none of these