1
JEE Main 2019 (Online) 11th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
In a Young's double slit experiment, the path difference, at a certain point on the screen, between two interfering waves is $${1 \over 8}$$ th of wavelength. The ratio of the intensity at this point to that at the centre of a bright fringe is close to :
A
0.94
B
0.85
C
0.74
D
0.80
2
JEE Main 2019 (Online) 11th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
An object is at a distance of 20 m from a convex lens of focal length 0.3 m. The lens forms an image of the object. If the object moves away from the lens at a speed of 5 m/s, the speed and direction of the image will be :
A
1.16 $$ \times $$ 10–3 m/s towards the lens
B
2.26 $$ \times $$ 10–3 m/s away from the lens
C
3.22 × 10–3 m/s towards the lens
D
0.92 $$ \times $$ 10$$-$$3 m/s away from the lens
3
JEE Main 2019 (Online) 11th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
The variation of refractive index of a crown glass thin prism with wavelength of the incident light is shown. Which of the following graphs is the correct one, if Dm is the angle of minimum deviation?

JEE Main 2019 (Online) 11th January Morning Slot Physics - Ray & Wave Optics Question 187 English
A
JEE Main 2019 (Online) 11th January Morning Slot Physics - Ray & Wave Optics Question 187 English Option 1
B
JEE Main 2019 (Online) 11th January Morning Slot Physics - Ray & Wave Optics Question 187 English Option 2
C
JEE Main 2019 (Online) 11th January Morning Slot Physics - Ray & Wave Optics Question 187 English Option 3
D
JEE Main 2019 (Online) 11th January Morning Slot Physics - Ray & Wave Optics Question 187 English Option 4
4
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
The eye can be regarded as a single refracting surface. The radius of curvature of this surface is equal to that of cornea (7.8 mm). This surface separateds two media of refractive indices 1 and 1.34. Calculate the distance from the refracting surface at which a parallel beam of light will come to focus -
A
2 cm
B
3.1 cm
C
4.0 cm
D
1 cm
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