1
JEE Main 2021 (Online) 26th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Car B overtakes another car A at a relative speed of 40 ms$$-$$1. How fast will the image of car B appear to move in the mirror of focal length 10 cm fitted in car A, when the car B is 1.9 m away from the car A?
A
4 ms$$-$$1
B
0.2 ms$$-$$1
C
40 ms$$-$$1
D
0.1 ms$$-$$1
2
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
The expected graphical representation of the variation of angle of deviation '$$\delta$$' with angle of incidence 'i' in a prism is :
A
JEE Main 2021 (Online) 27th July Evening Shift Physics - Ray & Wave Optics Question 90 English Option 1
B
JEE Main 2021 (Online) 27th July Evening Shift Physics - Ray & Wave Optics Question 90 English Option 2
C
JEE Main 2021 (Online) 27th July Evening Shift Physics - Ray & Wave Optics Question 90 English Option 3
D
JEE Main 2021 (Online) 27th July Evening Shift Physics - Ray & Wave Optics Question 90 English Option 4
3
JEE Main 2021 (Online) 27th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
The relative permittivity of distilled water is 81. The velocity of light in it will be :

(Given $$\mu$$r = 1)
A
4.33 $$\times$$ 107 m/s
B
2.33 $$\times$$ 107 m/s
C
3.33 $$\times$$ 107 m/s
D
5.33 $$\times$$ 107 m/s
4
JEE Main 2021 (Online) 27th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
In Young's double slit experiment, if the source of light changes from orange to blue then :
A
the central bright fringe will become a dark fringe.
B
the distance between consecutive fringes will decrease.
C
the distance between consecutive fringes will increases.
D
the intensity of the minima will increase.
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