Wave Optics-Diffraction Due to a Single Slit Width of Central Maximum (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 4 of 20

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Question number: 1

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

Edit
Assertion-Reason▾

Question

Assertion (Ꭺ)

If a plane glass slab is placed on the letters of different colors all the letters appear to be raised up to the same height.

Reason (Ꭱ)

Different colors have different wavelengths.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 2

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

Edit
MCQ▾

Question

In Fresnel diffraction, if the distance between the disc and the screen is decreased, the intensity of central bright spot will

Choices

Choice (4) Response

a.

Remain constant

b.

decrease

c.

Increase

d.

Question does not provide sufficient data or is vague

Question number: 3

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

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MCQ▾

Question

A screen is placed 2 m away from the single narrow slit. Calculate the slit width if the first minimum lies 5 mm on either side of the central maximum. Incident plane waves have a wavelength of 5000 Å.

Choices

Choice (4) Response

a.

2 × 10 -4 cm

b.

2 × 10 -4 m

c.

2 × 10 -3 cm

d.

None of the above

Question number: 4

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

Edit
MCQ▾

Question

Two spectral line of sodium D 1 & D 2 have wavelengths of approximately 5890 Å and 5896 Å. A sodium lamp sends incident plane wave on to a slit of width 2 micrometer. A screen is located at 2 m from the slit. Find the spacing between the first maxima of two sodium lines as measured on the screen.

Choices

Choice (4) Response

a.

9 × 10 -4

b.

10 -4 m

c.

9 × 10 4 m

d.

All of the above

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