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,

Beam Travelling from Region I to Region IV

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

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

Edit

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.

Edit

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

Edit