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JEE 2020 Physics: Wave Optics Quiz 1 (27.08.2019)

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Question 1

The critical of a certain medium is sin^-1 $Description: E:\KCET-1-Feb\KARNATAKA-CET-2011_files\image111.png$ . The polarizing angle of the medium is

Question 2

An UFO is emitting light and moving towards observer with speed of 4 Km/s and observer is moving towards UFO with speed of 0.5 Km/s. What will be the fractional change in frequency of light as observed by observer?

Question 3

A travelling acoustic wave of frequency 500 Hz is moving along the positive x-direction with a velocity of 300 m^s-1. The phase difference between two points x₁ and x₂ Is 60°. Then the minimum separation between the two points is

Question 4

A polarized light of intensity I_º is passed through another polarizer whose pass axis makes an angle of 60 º with the pass axis of the former. What is the intensity of emergent º polarized light from second polarizer?

Question 5

What will be the shape of the wavefront of alpha particle from a distant star as intercepted by earth?

Question 6

A physicist made a light that is the mixture of light of wavelength between 150 nm to 450 nm. If this light goes through a medium of refractive index ( µ=1.5). What is the limits of wavelength when the light is passing through the medium?

Question 7

A unpolarized light of intensity

passes successively through two identical linear polarizers A and B, placed such that their polarisation axes are at an angle 45 º with respect to one another.
Assuming A and B to be perfect polarisers (no absorption losses), the intensity I_T of the transmitted light will be

Question 8

Unpolarized light of intensity I passes through an ideal polarizer A. Another identical polarizer B is placed behind A. The intensity of light beyond B is found to be

Now another identical polarizer C is placed between A and B. The intensity beyond B is now found to be

The angle between polarizer A and C is :

Question 9

A person lives in a high-rise building on the bank of a river 50 m wide. Across the river is a well lit tower of height 40 m. When the person, Who is at a height of 10 m, looks through a polarizer at an appropriate angle at light of the tower reflection from the river surface, he notes that intensity of light coming from distance X from his building is the least and this corresponds to the light coming from light bulbs at height ‘Y’ on the tower. The values of X and Y are respectively close to (refractive index of water

)

Question 10

Critical angle for certain medium is sin^-1(0.6). the polarizing angle of that medium is

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Sep 12JEE & BITSAT