1
JEE Main 2019 (Online) 11th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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
MCQ (Single Correct Answer)
+4
-1
Change Language
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 - Geometrical Optics Question 150 English
A
JEE Main 2019 (Online) 11th January Morning Slot Physics - Geometrical Optics Question 150 English Option 1
B
JEE Main 2019 (Online) 11th January Morning Slot Physics - Geometrical Optics Question 150 English Option 2
C
JEE Main 2019 (Online) 11th January Morning Slot Physics - Geometrical Optics Question 150 English Option 3
D
JEE Main 2019 (Online) 11th January Morning Slot Physics - Geometrical Optics Question 150 English Option 4
3
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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
MCQ (Single Correct Answer)
+4
-1
Change Language
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
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