Wave Optics Book Back Questions & Answers
Unit 7 > Physics > Class 12 > Samacheer Kalvi - English Medium
-
1. A plane glass is placed over a various coloured letters (violet, green, yellow, red) The letter which appears to be raised more is,
(a) red
(b) yellow
(c) green
(d) violet
Correct answer: (d) violet
-
2. Two point white dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm approximately. The maximum distance at which these dots can be resolved by the eye is, [take wavelength of light, = 500 nm]
(a) 1 m
(b) 5 m
(c) 3 m
(d) 6m
Correct answer: (b) 5 m
-
3. In a Youngs double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to,
(a) 2D
(b) D 2
(c) 2D
(d) D 2
Correct answer: (a) 2D
-
4. Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are [IIT-JEE 1988]
(a) 5I and I
(b) 5I and 3I
(c) 9I and I
(d) 9I and 3I
Correct answer: (c) 9I and I
-
5. When light is incident on a soap film of thickness 5105 cm, the wavelength of light reflected maximum in the visible region is 5320 . Refractive index of the film will be,
(a) 1.22
(b) 1.33
(c) 1.51
(d) 1.83.
Correct answer: (b) 1.33
-
6. First diffraction minimum due to a single slit of width 1.0105 cm is at 30o . Then wavelength of light used is,
(a) 400
(b) 500
(c) 600
(d) 700
Correct answer: (b) 500
-
7. A ray of light strikes a glass plate at an angle 60o . If the reflected and refracted rays are perpendicular to each other, the refractive index of the glass is,
(a) 3
(b) 3 2
(c) 3 2
(d) 2
Correct answer: (a) 3
-
8. One of the of Youngs double slits is covered with a glass plate as shown in figure. The position of central maximum will, Glass slide Screen
(a) get shifted downwards
(b) get shifted upwards
(c) will remain the same
(d) data insufficient to conclude
Correct answer: (b) get shifted upwards
-
9. Light transmitted by Nicol prism is,
(a) partially polarised
(b) unpolarised
(c) plane polarised
(d) elliptically polarised
Correct answer: (c) plane polarised
-
10. The transverse nature of light is shown in,
(a) interference
(b) diffraction
(c) scattering
(d) polarisation
Correct answer: (d) polarisation