1
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
Change Language
In a diffraction pattern due to a single slit of width $$a$$, the first minimum is observed at an angle 30o when light of wavelength 5000 $$\mathop A\limits^ \circ $$ is incident on the slit. The first secondary maximum is observed at an angle of
A
sin$$-$$1$$\left( {{1 \over 2}} \right)$$
B
$${\sin ^{ - 1}}\left( {{3 \over 4}} \right)$$
C
$${\sin ^{ - 1}}\left( {{1 \over 4}} \right)$$
D
$${\sin ^{ - 1}}\left( {{2 \over 3}} \right)$$
2
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Change Language
At the first minimum adjacent to the central maximum of a single-slit diffraction pattern, the phase difference between the Huygen's wavelet from the edge of the slit and the wavelet from the midpoint of the slit is
A
$$\pi $$ radian
B
$${\pi \over 8}$$ radian
C
$${\pi \over 4}$$ radian
D
$${\pi \over 2}$$ radian
3
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Change Language
Two slits in Young's experiment have widths in the ratio 1 : 25. The ratio of intensity at the maxima and minima in the interference pattern, $${{{I_{max}}} \over {{I_{min}}}}$$ is
A
$${{49} \over {121}}$$
B
$${4 \over 9}$$
C
$${9 \over 4}$$
D
$${{121} \over {49}}$$
4
AIPMT 2015 Cancelled Paper
MCQ (Single Correct Answer)
+4
-1
Change Language
For a parallel beam of monochromatic light of wavelength '$$\lambda $$' , diffraction is produced by a single slit whose width 'a' is of the order of the wavelength of the light. If 'D' is the distance of the screen from the slit, the wifth of the central maxima will be
A
$${{Da} \over \lambda }$$
B
$${{2Da} \over \lambda }$$
C
$${{2D\lambda } \over a}$$
D
$${{D\lambda } \over a}$$
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