Wave Optics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 6 - 9 of 64

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Question number: 6

» Wave Optics » Wavefront

Assertion-Reason▾

Question

Assertion (Ꭺ)

The cloud in sky generally appears to be whitish.

Reason (Ꭱ)

Diffraction due to clouds is efficient in equal measure at all wavelengths.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

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

c.

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

d.

Both Ꭺ and Ꭱ are false

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Question number: 7

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

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

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Question number: 8

» Wave Optics » Polarization

MCQ▾

Question

Which statements are incorrect for a zone plate and a lens?

(1) Zone plate has one focus whereas lens has multiple focal lengths

(2) Both zone plate and lens have multi focal lengths

(3) Zone plate has one focus whereas a lens has infinite

(4) Zone plate has multi focal lengths whereas lens has one

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

Codes:

Choices

Choice (4) Response

a.

1,2 and 3 are correct

b.

1 and 3 are correct

c.

2 and 4 are correct

d.

1 and 2 are correct

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Question number: 9

» Wave Optics » Polarization

Assertion-Reason▾

Question

Assertion (Ꭺ)

A Nicol prism can produce polarised light. It can also analyses plane polarised light.

Reason (Ꭱ)

Nicol prism reduces the intensity of light to zero.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

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

c.

Both Ꭺ and Ꭱ are false

d.

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

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