Question # 1

The image of an object 5 mm high is only 1 cm high. The magnification of the lens is

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0.2

0.5

1

2

The maximum distance between an object and its real image in case of convex lens is

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f

2f

2.5 f

4 f

Chromatic aberration can be removed by using.

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Convex lens

Two convex lenses

Concave lens

Combination of a convex lens and a concave lens

Which Muslim Scientist gave the first clear description and correct analysis of pinhole camera.

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Nasir al Din Al tusi

Ibn al Haithem

Ibn Ishaqal kundi

al -Khawarizmi

A double convex an bubble in water will behave as.

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Plane slab

Concave mirror

Convex lens

Concave lens

A fixed point inside the lens through which a ray of light does not change its path is called.

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Pole

Focus

Centre of curvature

Opticla centre

Which term is used for human eye deflect near sightedness.

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Myopia

Hypermetropia

Presbyopia

Calaract

In compound microscope, image formed by the eyepiece is

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Real

Invented

Erect

Diminished

The object of a telescope is very large this is to have an image which is.

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More magnified

Of better resolution

More bright

More clear

Two convex lenses of equal focal length 'f' are placed in contact, the resultant focal length is

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Zero

1

2f

f/2

The focal length of a thin converging lens is 10 cm What is the maximum distance from the lens that the object can be placed so that the lens acts as a magnifying glass.

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5 cm

10 cm

15 cm

20 cm

The variation of focal length of a lens when we pass from the central portion to periphery is called.

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Coma

Astigmatism

Spherical aberration

Chromatic aberration

Which type of microscope was the first to be developed.

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Optical microscope

Digital microscope

Electron microscope

All were developed at the same time

A diverging lens may not have

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Negative focal length

Positive focal length

One plane surface

One convex surface

The main advantage of step index fiber is.

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The size of the cable

The equality of the cbale

Difference in the wavelengths of signals

All of the above

Which of the following is used as a remedy for defect of hypermetropia.

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Convex lens

Concave lens

Cylindrical lens

Bifocal length lens

Which is the thick circular structure in teh eye containing an aperture with variable diameter It controls the amount of light reaching the retina.

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Retina

Iris

Pupil

Cornea

When the angel of incidence becomes larger than the critical angle no refraction occurs This is known is.

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Diffraction

Refraction

Total internal reflection

Diffuse reflection

A real object paled inside the focus of a convex lens gives

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Real image but diminshed

Real image but enlarged

virtual image but diminished

Virtual image but enlarged

A bi prism consists of.

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Two parallel glass plates

Two acute angled prisms

Two obtuse angled prisms

Two right angled prisms

The value of critical angle of glass is

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45^o

42^o

48^o

52^o

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