1
JEE Main 2019 (Online) 11th January Evening Slot
+4
-1
A monochromatic light is incident at a certain angle on an equilateral triangular prism and suffers minimum deviation. If the refractive index of the material of the prism is $$\sqrt 3$$, then the angle of incidence is:
A
60o
B
45o
C
90o
D
30o
2
JEE Main 2019 (Online) 11th January Morning Slot
+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
+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?

A
B
C
D
4
JEE Main 2019 (Online) 10th January Evening Slot
+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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