1
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
2
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
3
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
4
JEE Main 2019 (Online) 10th January Morning Slot
+4
-1
A plano convex lens of refractive index $$\mu$$1 and focal length ƒ1 is kept in contact with another plano concave lens of refractive index $$\mu$$2 and focal length ƒ2. If the radius of curvature of their spherical faces is R each and ƒ1 = 2ƒ2, then $$\mu$$1 and $$\mu$$2 are related as -
A
$$3{\mu _2} - 2{\mu _1}$$ = 1
B
$${\mu _1} + {\mu _2}$$ = 3
C
$$2{\mu _1} - {\mu _2}$$ = 1
D
$$2{\mu _2} - {\mu _1}$$ = 1
EXAM MAP
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