Wave Optics

JEE Advanced 2024 Paper 1NumericalEasy📈 Topic in 33% papers+4

Ques. 1JEE Advanced 2024 (Paper-1)

A point source S emits unpolarized light uniformly in all directions. At two points A and B, the ratio r=IA/IB of the intensities of light is 2. If a set of two polaroids having 45 angle between their pass-axes is placed just before point B, then the new value of r will be .

Answer

Solution

First polaroid passes half of unpolarized light: IB2.

Second polaroid (Malus' law): IB2 245 = IB4.

New ratio r= IAIB/4=4 2=8.

Answer: 8

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Ques. 2JEE Advanced 2024 (Paper-2)

The 8th bright fringe above the point O oscillates with time between two extreme positions. The separation between these two extreme positions, in micrometer ( m), is .

Ques. 3JEE Advanced 2024 (Paper-2)

The maximum speed in m/s at which the 8th bright fringe will move is .

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