JEE Main 2019 (Online) 11th January Morning Slot | Ray & Wave Optics Question 187 | Physics

JEE Main 2019 (Online) 11th January Morning Slot

MCQ (Single Correct Answer)

-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 :

0.94

0.85

0.74

0.80

JEE Main 2019 (Online) 11th January Morning Slot

MCQ (Single Correct Answer)

-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 :

1.16 $$ \times $$ 10^–3 m/s towards the lens

2.26 $$ \times $$ 10^–3 m/s away from the lens

3.22 × 10^–3 m/s towards the lens

0.92 $$ \times $$ 10^$$-$$3 m/s away from the lens

JEE Main 2019 (Online) 11th January Morning Slot

MCQ (Single Correct Answer)

-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 D_m is the angle of minimum deviation?

JEE Main 2019 (Online) 11th January Morning Slot Physics - Ray & Wave Optics Question 187 English

JEE Main 2019 (Online) 11th January Morning Slot Physics - Ray & Wave Optics Question 187 English

JEE Main 2019 (Online) 11th January Morning Slot Physics - Ray & Wave Optics Question 187 English Option 1

JEE Main 2019 (Online) 11th January Morning Slot Physics - Ray & Wave Optics Question 187 English Option 2

JEE Main 2019 (Online) 11th January Morning Slot Physics - Ray & Wave Optics Question 187 English Option 3

JEE Main 2019 (Online) 11th January Morning Slot Physics - Ray & Wave Optics Question 187 English Option 4

JEE Main 2019 (Online) 10th January Evening Slot

MCQ (Single Correct Answer)

-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 -

2 cm

3.1 cm

4.0 cm

1 cm

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