Question # 1

The diameter of a lens is called

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Focal length

Aperture

Principle axis

Centre

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 speed of light was measured correctly by

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Galileo

Michelson

Newton

Maxwell

The Detector in Photo phone is made up of.

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Cadmium

Germanium

Selenium

Silicon

Which is not the essential component of a spectrometer.

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Collimator

Telescope

Turntable

Microscope

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

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Telescope

Optical fibre

Spectrometer

Microscope

Total confined light is obtained by

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Total internal reflection

Refraction of light

Diffraction

Polarization

The ratio of size of image and size of object is

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Focal length

Magnification

Resolving power

Principle focus

For normal adjustment what is the length of astronomical telescope if focal lengths of astronomical telescope if focal lengths of objective and eye piece are 100 cm 20 cm respectively.

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10 cm

20 cm

5 cm

120 cm

A convex lens acts as diverging lens if the object is placed at

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F

2F

Between F and 2 F

Within the F

Multimode step index fiber is useful for.

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Long distance

Sort distance

Very long distance

Infinite distance

__ will travel faster than other through an optical fibre.

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Ultraviolet light

Visible light

Infrared light

White light

The focal length of a concave lens is always

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+ve

-ve

Zero

None of these

The magnifying power of an astronomical telescope is 10. If the focal length of objective is 100 cm, then what is the focal length of eye piece.

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10 cm

100 cm

1000 cm

5 cm

In an object is placed in between focus point and Opticla center of a convex lens, the image formed by lens is.

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Real inverted

Virtual diminshed

Virtual inverted

Virtual erected

Information carrying capacity of optical fibre called.

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Capacity

Band width

Immunity

Ability

If an object is placed with in the focal length of a convex lens, its image is formed.

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Real

Inverted

Virtual

Smaller than object

The minimum distance from eye at which an object appears to be distinct is

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Near point

Focal length

Image distance from lens

Object distance from lens

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