1
JEE Main 2022 (Online) 29th July Evening Shift
+4
-1 An unpolarised light beam of intensity $$2 I_{0}$$ is passed through a polaroid P and then through another polaroid Q which is oriented in such a way that its passing axis makes an angle of $$30^{\circ}$$ relative to that of P. The intensity of the emergent light is

A
$$\frac{\mathrm{I}_{0}}{4}$$
B
$$\frac{\mathrm{I}_{0}}{2}$$
C
$$\frac{3 I_{0}}{4}$$
D
$$\frac{3 \mathrm{I}_{0}}{2}$$
2
JEE Main 2022 (Online) 29th July Evening Shift
+4
-1 Light enters from air into a given medium at an angle of $$45^{\circ}$$ with interface of the air-medium surface. After refraction, the light ray is deviated through an angle of $$15^{\circ}$$ from its original direction. The refractive index of the medium is:

A
1.732
B
1.333
C
1.414
D
2.732
3
JEE Main 2022 (Online) 28th July Evening Shift
+4
-1 The power of a lens (biconvex) is $$1.25 \mathrm{~m}^{-1}$$ in particular medium. Refractive index of the lens is 1.5 and radii of curvature are $$20 \mathrm{~cm}$$ and $$40 \mathrm{~cm}$$ respectively. The refractive index of surrounding medium:

A
1.0
B
$$\frac{9}{7}$$
C
$$\frac{3}{2}$$
D
$$\frac{4}{3}$$
4
JEE Main 2022 (Online) 28th July Morning Shift
+4
-1 As shown in the figure, after passing through the medium 1 . The speed of light $$v_{2}$$ in medium 2 will be :

$$\left(\right.$$ Given $$\mathrm{c}=3 \times 10^{8} \mathrm{~ms}^{-1}$$ ) A
$$1.0 \times 10^{8} \mathrm{~ms}^{-1}$$
B
$$0.5 \times 10^{8} \mathrm{~ms}^{-1}$$
C
$$1.5 \times 10^{8} \mathrm{~ms}^{-1}$$
D
$$3.0 \times 10^{8} \mathrm{~ms}^{-1}$$
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