JEE Main 2019 (Online) 11th January Evening Slot | Ray & Wave Optics Question 185 | Physics

JEE Main 2019 (Online) 11th January Evening Slot

MCQ (Single Correct Answer)

-1

In a double-slit experiment, green light (5303$$\mathop A\limits^ \circ $$) falls on a double slit having a separation of 19.44 $$\mu $$m and awidht of 4.05 $$\mu $$m. The number of bright fringes between the first and the second diffraction minima is :

JEE Main 2019 (Online) 11th January Evening Slot

MCQ (Single Correct Answer)

-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:

60^o

45^o

90^o

30^o

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

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