Wave Optics-Polarization (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 4 of 9
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Question number: 1
» Wave Optics » Polarization
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 |
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| b. | 1 and 3 are correct |
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| c. | 2 and 4 are correct |
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| d. | 1 and 2 are correct |
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Question number: 2
» Wave Optics » Polarization
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 |
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| b. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ |
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| c. | Both Ꭺ and Ꭱ are false |
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| d. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ |
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Question number: 3
» Wave Optics » Polarization
Question
Unpolarised light of intensity 32 Wm -2 passes through three polarizers such that the transmission axis of the last polarizer is crossed with the first. If the intensity of the emerging light is 3 Wm -2, at what angle will the transmitted intensity be maximum?
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 15° |
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| b. | 75° |
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| c. | 35° |
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| d. | 45° |
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Question number: 4
» Wave Optics » Polarization
Question
Two Polaroids are oriented with their planes perpendicular to incident light and transmission axis making an angle of 30 0 with each other. What fraction of incident unpolarised light is transmitted?
Choices
| Choice (4) | Response | |
|---|---|---|
| a. | 37.5 % |
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| b. | 27.5 % |
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| c. | 57.5 % |
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| d. | 17.5 % |
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