Q5. A slit width 12*10^{-7} m is illminated by light of wavelenght 6000 A. The angular width of the central maxima is appoximately................
(A) 30°
(B) 60°
(C) 90°
(D) 0°
Q6. The distance between the first and sixth minima in the diffration pattern of a single slit, it is 0.5 mm. The screen is 0.5 m away from the slit. If the wavelength of light is 5000 A^{°}. Then the width of the slit will be ............... mm
(A) 5
(B) 2.5
(C) 1.25
(D) 1.0
Q7. ................. change in the polarization phenomia of light ?
(A) Intensity
(B) Wavelenght
(C) Phase
(D) Frequency
Q8. In young's double slit experiment the phase difference is constant between two source is π/2. The intensity at a point equal distance from the slits of max. intensity I_{0} is ...................
(A) 3 I_{0} (B) I_{0}/2
(C) I_{0} (D) 3I_{0}/4
Q9. The two coherence source of intensity β produce interference. The fringe visibility will be .......
(A) 2β
(B) β/2
(C) √β/1+β
(D) 2√β/1+β
Q10. A polarizer is used for ..........
(A) produce polarzised light
(B)produce unpolarized light
(C) Produce unpolarized light
(D) none of these
ANSWER
(Ans 1.) A
(Ans 2.) D
(Ans 3.) B
(Ans 4.) C
(Ans 5.) B
(Ans 6.) B
(Ans 7.) A
(Ans 8.) B
(Ans 9.) D
(Ans 10.) A