1
JEE Main 2021 (Online) 26th August Morning Shift
+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
+4
-1
The expected graphical representation of the variation of angle of deviation '$$\delta$$' with angle of incidence 'i' in a prism is :
A
B
C
D
3
JEE Main 2021 (Online) 25th July Evening Shift
+4
-1
A prism of refractive index $$\mu$$ and angle of prism A is placed in the position of minimum angle of deviation. If minimum angle of deviation is also A, then in terms of refractive index
A
$$2{\cos ^{ - 1}}\left( {{\mu \over 2}} \right)$$
B
$${\sin ^{ - 1}}\left( {{\mu \over 2}} \right)$$
C
$${\sin ^{ - 1}}\left( {\sqrt {{{\mu - 1} \over 2}} } \right)$$
D
$${\cos ^{ - 1}}\left( {{\mu \over 2}} \right)$$
4
JEE Main 2021 (Online) 25th July Evening Shift
+4
-1
A ray of light entering from air into a denser medium of refractive index $${4 \over 3}$$, as shown in figure. The light ray suffers total internal reflection at the adjacent surface as shown. The maximum value of angle $$\theta$$ should be equal to :

A
$${\sin ^{ - 1}}{{\sqrt 7 } \over 3}$$
B
$${\sin ^{ - 1}}{{\sqrt 5 } \over 4}$$
C
$${\sin ^{ - 1}}{{\sqrt 7 } \over 4}$$
D
$${\sin ^{ - 1}}{{\sqrt 5 } \over 3}$$
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