Page 2 - Wave Optics Work Sheet -3

(c) frequency of light used

(d) focal length of objective
11. When unpolarised light beam is incident from air onto glass (n = 1.5) at
the polarising angle.
(a) Reflected beam is polarised completely
(b) Reflected and refracted beams are partially polarised
(c) Refracted beam is plane polarised

(d) Whole beam of light is refracted
12. An unpolarised beam of intensity I 0 is incident on a pair of nicols making
angle of 60° with each other. The intensity of right emerging from the
pair is

13. When compact disk is illuminated by a source of white light, coloured

lines are observed. This is due to
(a) dispersion
(b) diffraction

(c) interference
(d) refraction
14. Polarisation of light proves
(a) corpuscular nature of light.
(b) quantum nature of light.

(c) transverse wave nature of light.
(d) longitudinal wave nature of light.
15. To observe diffraction, the size of the obstacle
(a) should beX/2, where X is the wavelength.

(b) should be of the order of wavelength.
(c) has no relation to wavelength.
(d) should be much larger than the wavelength.