Question:

A new system of units is evolved in which the values of $\mu_0$ and $\epsilon_0$are 2 and 8 respectively. Then the speed of light in this system will be

Updated On: Nov 23, 2024

0.25
0.5
0.75
1

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The Correct Option is A

Solution and Explanation

Velocity of electromagnatic wave in space is $c=\frac{1}{\sqrt{\mu_0\epsilon_0}} \Rightarrow c=\frac{1}{\sqrt{2??}}$ $=\frac{1}{\sqrt{16}}=\frac{1}{4}=0.25$

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Top Questions on Reflection Of Light By Spherical Mirrors

A light ray is incident on the surface of a sphere of refractive index n at an angle of incidence $\theta_0$. The ray partially refracts into the sphere with angle of refraction $\phi$ and then partly reflects from the back surface. The reflected ray then emerges out of the sphere after a partial refraction. The total angle of deviation of the emergent ray with respect to the incident ray is $a$. Match the quantities mentioned in List-I with their values in List-II and choose the correct option.

List-I		List-II
P	If $n = 2$ and $\alpha = 180°$, then all the possible values of $\theta_0$ will be	I	$30\degree$ or $0\degree$
Q	If $n = √3$ and $\alpha= 180°$, then all the possible values of $\theta_0$ will be	II	$60\degree$ or $0\degree$
R	If $n = √3$ and $\alpha= 180°$, then all the possible values of $\phi_0$ will be	III	$45\degree$ or $ 0\degree$
S	If $n = \sqrt2$ and $\theta_0 = 45°$, then all the possible values of $\alpha$ will be	IV	$150\degree$
			\[0\degree\]

JEE Advanced - 2024
Physics
Reflection Of Light By Spherical Mirrors

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Concepts Used:

Reflection of Light

When a light ray falls on any object, it is bounced back from the object. This process is known as the Reflection of light. The light reflected from the object falls into our eyes, making the object visible to us. All the things we see around us are because of reflection.

The reflection of light depends on the type of object. A polished or smooth surface reflects most of the light falling on it, while a rough surface absorbs some amount of light and reflects back the rest of the light. The direction of reflected rays depends upon the surface of the object.

List-I		List-II
P	If \(n = 2\) and \(\alpha = 180°\), then all the possible values of \(\theta_0\) will be	I	\(30\degree\) or \(0\degree\)
Q	If \(n = √3\) and \(\alpha= 180°\), then all the possible values of \(\theta_0\) will be	II	\(60\degree\) or \(0\degree\)
R	If \(n = √3\) and \(\alpha= 180°\), then all the possible values of \(\phi_0\) will be	III	\(45\degree\) or \( 0\degree\)
S	If \(n = \sqrt2\) and \(\theta_0 = 45°\), then all the possible values of \(\alpha\) will be	IV	\(150\degree\)
			\[0\degree\]