# Wave Optics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 42 - 46 of 64

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## Passage

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

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

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

MCQ▾

### Question

The wavelength of the light is

### Choices

Choice (4) Response

a.

5200 Å

b.

5000 Å

c.

4200 Å

d.

3500 Å

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## 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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## Question number: 45

» Wave Optics » Young's Double Slit Experiment

MCQ▾

### Question

In Young’s double slit experiment, the distance between two slits is made three times then the fringe width will become –

### Choices

Choice (4) Response

a.

b.

c.

d.

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## Question number: 46

» Wave Optics » Polarization

MCQ▾

### Question

Plane polarised light is passed through a polaroid. On viewing through the polaroid we find that when the polaroid is given one complete rotation about the direction of the light, which of the following is not observed?

(1) The intensity of light gradually decreases to zero and remains at zero

(2) The intensity of light gradually increases to a maximum and remains at maximum

(3) There is no change in intensity

(4) The intensity of light is twice maximum and twice zero

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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