1
JEE Main 2022 (Online) 26th July Evening Shift
+4
-1 Light travels in two media $$M_{1}$$ and $$M_{2}$$ with speeds $$1.5 \times 10^{8} \mathrm{~ms}^{-1}$$ and $$2.0 \times 10^{8} \mathrm{~ms}^{-1}$$ respectively. The critical angle between them is :

A
$$\tan ^{-1}\left(\frac{3}{\sqrt{7}}\right)$$
B
$$\tan ^{-1}\left(\frac{2}{3}\right)$$
C
$$\cos ^{-1}\left(\frac{3}{4}\right)$$
D
$$\sin ^{-1}\left(\frac{2}{3}\right)$$
2
JEE Main 2022 (Online) 26th July Morning Shift
+4
-1 In Young's double slit experiment, the fringe width is $$12 \mathrm{~mm}$$. If the entire arrangement is placed in water of refractive index $$\frac{4}{3}$$, then the fringe width becomes (in mm):

A
16
B
9
C
48
D
12
3
JEE Main 2022 (Online) 25th July Evening Shift
+4
-1 For an object placed at a distance 2.4 m from a lens, a sharp focused image is observed on a screen placed at a distance 12 cm from the lens. A glass plate of refractive index 1.5 and thickness 1 cm is introduced between lens and screen such that the glass plate plane faces parallel to the screen. By what distance should the object be shifted so that a sharp focused image is observed again on the screen?

A
0.8 m
B
3.2 m
C
1.2 m
D
5.6 m
4
JEE Main 2022 (Online) 25th July Morning Shift
+4
-1 Which of the following statement is correct?

A
In primary rainbow, observer sees red colour on the top and violet on the bottom
B
In primary rainbow, observer sees violet colour on the top and red on the bottom
C
In primary rainbow, light wave suffers total internal reflection twice before coming out of water drops.
D
Primary rainbow is less bright than secondary rainbow.
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