NEET Physics: Questions 1127 - 1129 of 2098

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Question number: 1127

» Ray Optics » Deviation and Dispersion of Light by a Prism

MCQ▾

Question

The dispersive powers of crown and flint glasses are 0.03 and 0.05 respectively. The refractive indices for yellow light for these glasses are 1.517 and 1.621 respectively. It is desired to form an achromatic combination of prisms of crown and flint glasses which can produce a deviation of 1° in the yellow ray. The refracting angle of the flint glass prism is,

Choices

Choice (4) Response

a.

3.4°

b.

2.4°

c.

1.4°

d.

5.2°

Question number: 1128

» Ray Optics » Total Internal Reflection

MCQ▾

Question

An optical fiber consists of core of μ 1 surrounded by a cladding of μ < μ 1. A beam of light enters from air at an angle α with axis of fiber. The highest a for which ray can be travelled through fiber is

Optical fiber consist of core and cladding

Optical Fiber Consist of Core and Cladding

In figure an optical fiber consists of core of μ1 surrounded by a cladding of μ < μ1. A beam of light enters from air at an angle α with axis of fiber.

Choices

Choice (4) Response

a.

tan1μ12μ22

b.

cos1μ22μ12

c.

sec1μ12μ22

d.

sin1μ12μ22

Question number: 1129

» Atoms and Nuclei » Bohr Model

MCQ▾

Question

In the Bohr model of a hydrogen atom, the centripetal force is furnished by the coulomb attraction between the proton and the electron. If a 0 is the radius of the ground state orbit, m is the mass, e is the charge on the electron and s 0 is the vacuum permittivity, the speed of the electron is

Choices

Choice (4) Response

a.

4πε0a0me

b.

eε0a0m

c.

e4πε0a0m

d.

0

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