Question # 1

The diameter of a lens is called

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Focal length

Aperture

Principle axis

Centre

Critical angle is that angle of incident ofr which angle of refraction is.

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90 ^o

45 ^o

42 ^o

24 ^o

The accepted value for speed of light in vacuum

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2.99 x 10⁸m - sec^-1

2.99 x 10⁶m - sec^-1

2.99 x 10⁸km - sec^-1

2.99 x 10⁸m - h^-1

The final image formed by a simple microscope.

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Virtual and inverted

Real and erected

Virtual and erected

Real and inverted

The device used to study the spectra from different sources of light is

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Telescope

Optical fibre

Spectrometer

Microscope

The focal length of convex lens

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Negative

Positive

small

Large

The ratio of size of image and size of object is

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Focal length

Magnification

Resolving power

Principle focus

Using a graded Index fibre, the time difference is reduced to about.

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1 ns per km

33 ns per 100 km

33 ns per km

1 ns per 100 km

Which is not the essential component of a spectrometer.

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Collimator

Telescope

Turntable

Microscope

Information carrying capacity of optical fibre called.

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Capacity

Band width

Immunity

Ability

The units of magnifying power of microscope or telescope are.

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Metre

m^-1

dioptre

No unit

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