Ray Optics-Snell's Law [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 4 of 14
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Question 1
Question MCQ▾
A light beam is travelling from Region I to Region IV (Refer Figure) . The refractive index in Regions I, II, III and IV are respectively. The angle of incidence θ for which the beam just misses entering Region IV is,
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. |
Question 2
Question Assertion-Reason▾
Assertion(Ꭺ)
The focal length of a lens is different for all colors of light
Reason(Ꭱ)
The focal length depends only upon the material of the lens.
Choices
Choice (4) | Response | |
---|---|---|
a. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ | |
b. | Both Ꭺ and Ꭱ are false | |
c. | Ꭺ is true but Ꭱ is false | |
d. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ |
Question 3
Question MCQ▾
A ray of light is incident on a transparent glass-slab of refractive index 1.5. If the reflected and refracted rays are mutually perpendicular, what is the angle of incidence?
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | 300 | |
c. | ||
d. |
Question 4
Question MCQ▾
Light from a sodium lamp (λ0 = 589 nm) passes through a tank of glycerin (refractive index 1.47) 20 m long in a time t1 . If it takes a time to traverse the same tank when filled with carbon disulphide (index 1.63) , then the difference t2 - t1 is,
Choices
Choice (4) | Response | |
---|---|---|
a. | 1.07 × 10-8 sec | |
b. | 1.09 × 10-7 sec | |
c. | 2.07 × 10-7 sec | |
d. | 6.67 × 10-8 sec |