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

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Question number: 6

» Wave Optics » Wavefront

Assertion-Reason▾

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▾

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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