Wave Optics (NEET Physics): Questions 41 - 44 of 63

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Question number: 41

» Wave Optics » Wavefront

MCQ▾

Question

In the given diagram, CP represents a wavefront and AO & BP, the corresponding two rays. Find the condition on θ for constructive interference at P between the ray BP and reflected ray OP

Wavefront diagram with CP as wavefront

Wavefront Diagram With CP as Wavefront

In the given diagram, CP represents a wavefront and AO & BP, the corresponding two rays.

Choices

Choice (4) Response

a.

secθcosθ=λd

b.

secθcosλ=4λd

c.

cosθ=3λ2d

d.

cosθ=λ4d

Passage

Read the passage given below and answer the questions that follow:

Angular width of central maximum in the Fraunhoffer-diffraction pattern of a slit is measured. The slit is illuminated by light of wavelength 6000 Å. When, the slit is illuminated by light of another wavelength, the angular width decreases by 30%.

Question number: 42 (1 of 2 Based on Passage) Show Passage

» Wave Optics » Diffraction Due to a Single Slit Width of Central Maximum

MCQ▾

Question

The wavelength of the light is

Choices

Choice (4) Response

a.

5200 Å

b.

5000 Å

c.

4200 Å

d.

3500 Å

Question number: 43 (2 of 2 Based on Passage) Show Passage

» Wave Optics » Diffraction Due to a Single Slit Width of Central Maximum

MCQ▾

Question

The same decrease in the angular width of central maximum is obtained when the original apparatus is immersed in a liquid. Find refractive index of the liquid.

Choices

Choice (4) Response

a.

1.23

b.

1.43

c.

2.43

d.

2.2

Question number: 44

» Wave Optics » Young's Double Slit Experiment

MCQ▾

Question

The Young’s double slit experiment, the ratio of intensities of bright and dark fringes is 9. This means that

(1) The intensities of individual sources are 5 and 4 units respectively

(2) The intensities of individual sources are 4 and 1 units respectively

(3) The ratio of the their amplitudes is 3

(4) The ratio of their amplitude is 2

Select the correct answers and mark it according to the following codes:

Codes:

Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1, 2 and 3 are correct

c.

1 and 3 are correct

d.

1 and 2 are correct

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