Ray Optics (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 96 - 99 of 105

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Question number: 96

» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes

MCQ▾

Question

In a compound microscope the objective and the eye-piece have focal lengths of 0.95 cm and 5 cm respectively, and are kept at a distance of 20 cm. The last image is formed at a distance of 25 cm from the eye-piece. Calculate the total magnification.

Choices

Choice (4) Response

a.

75

b.

94

c.

84

d.

88

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Question number: 97

» 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°

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Question number: 98

» 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

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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Question number: 99

» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes

MCQ▾

Question

What should be the size of the aperture of the objective of telescope which can just resolve the two stars of angular width of 10 -3 degree by light of wavelength 5000Å?

Choices

Choice (4) Response

a.

3.5 cm

b.

3.5 mm

c.

3.5 m

d.

3.5 km

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