Wave Optics Test

Result

Wave Optics Test - 63

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Weekly Quiz Competition

Question 1
4 / -1

Two light rays having the same wavelength λ in vacuum are in phase initially. Then, the first ray travels a path L₁ through a medium of refractive index n₁ while the second ray travels a path of length L₂ through a medium of refractive index n₂. The two waves are then combined to produce interference. The phase difference between the two waves is

A

B

C

D

Solution
Question 2
4 / -1

Using the expression 2d sin θ = λ, one calculates the value of d by measuring the corresponding angles θ in the range 0 to 90°. The wavelength λ is exactly known and the error in θ is constant for all values of θ. As, increases from 0°

A
the absolute error in d remains constant

B
the absolute error in d increases

C
the fractional error in d remains constant

D
the fractional error in d decreases
Question 3
4 / -1

The condition for diffraction of mth order minima is

A

B

C

D
Question 4
4 / -1

A
2000 V

B
50 V

C
500 V

D
1000 V

Solution
Question 5
4 / -1

A

B

C

D
Question 6
4 / -1

Wave property of electrons implies that they will show diffraction effects. Davisson and Germer demonstrated this by diffracting electrons from crystals. The law governing the diffraction from a crystal is obtained by requiring that electron waves reflected from the planes of atoms in a crystal interfere constructively (see figure).

A

B

C

D
Question 7
4 / -1

In Fraunhofer diffraction experiment, L is the distance between screen and the obstacle, b is the size of obstacle and λ is wavelength of incident light. The general condition for the applicability of raunhofer diffraction is

A

B

C

D
Question 8
4 / -1

Following diffraction pattern was obtained using a diffraction grating using two different wavelengths λ₁ and λ₂. With the help of the figure identify which is the longer wavelength and their ratios?

A
λ₂ is longer than λ₁ and the ratio of the longer to the shorter wavelength is 1.5

B
λ₁ is longer than λ₂ and the ratio of the longer to the shorter wavelength is 1.5

C
λ₁ and λ₂ are equal and their ratio is 1.0

D
λ₂ is longer than λ₁ and the ratio of the longer to the shorter wavelength is 2.5
Question 9
4 / -1

In a Fraunhofer diffraction experiment at a single slit using a light of wavelength 400 nm, the first minimum is formed at an angle of 30°. The directipn θ of the first secondary maximum is given by

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B

C

D
Question 10
4 / -1

A

B

C

D

Solution