1
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
Diameter of a plano-convex lens is $$6$$ $$cm$$ and thickness at the center is $$3mm$$. If speed of light in material of lens is $$2 \times {10^8}\,m/s,$$ the focal length of the lens is
A
$$15$$ $$cm$$
B
$$20$$ $$cm$$
C
$$30$$ $$cm$$
D
$$10$$ $$cm$$
2
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
Two coherent point sources $${S_1}$$ and $${S_2}$$ are separated by a small distance $$'d'$$ as shown. The fringes obtained on the screen will be JEE Main 2013 (Offline) Physics - Ray & Wave Optics Question 249 English
A
points
B
straight lines
C
semi-circles
D
concentric circles
3
JEE Main 2013 (Offline)
MCQ (Single Correct Answer)
+4
-1
The graph between angle of deviation $$\left( \delta \right)$$ and angle of incidence $$(i)$$ for a triangular prism is represented by
A
JEE Main 2013 (Offline) Physics - Ray & Wave Optics Question 248 English Option 1
B
JEE Main 2013 (Offline) Physics - Ray & Wave Optics Question 248 English Option 2
C
JEE Main 2013 (Offline) Physics - Ray & Wave Optics Question 248 English Option 3
D
JEE Main 2013 (Offline) Physics - Ray & Wave Optics Question 248 English Option 4
4
AIEEE 2012
MCQ (Single Correct Answer)
+4
-1
In Young's double slit experiment , one of the slit is wider than other, so that amplitude of the light from one slit is double of that from other slit. If $${{\rm I}_m}$$ be the maximum intensity, the resultant intensity $${\rm I}$$ when they interfere at phase difference $$\phi $$ is given by :
A
$${{{I_m}} \over 9}\left( {4 + 5\cos \,\phi } \right)$$
B
$${{{I_m}} \over 3}\left( {1 + 2{{\cos }^2}\,{\phi \over 2}} \right)$$
C
$${{{I_m}} \over 3}\left( {1 + 4{{\cos }^2}\,{\phi \over 2}} \right)$$
D
$${{{I_m}} \over 9}\left( {1 + 8{{\cos }^2}\,{\phi \over 2}} \right)$$
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