Question # 1

The characteristic of an image formed by a plane mirror is.

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It is of the same size as the object

It is laterally inverted

It is upright

All of the above

When a ray of light enters a glass slab from air

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Its frequency increases

Its wavelength increases

Neither frequency nor wavelength change

Its wavelength decreases

Plossi or symmetrical eye piece consists of

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Two plano convex lenses with same focal length

Two sets of doublets

An achromatic double

A spherical doublet

Which of the following phenomenon is caused by the different speeds of light in differed optical media.

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Reflection

Refraction

Diffraction

Total internal reflection

Maximum detail of an object can be seen by a microscope when the object is illuminated by light of.

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Longer wavelegth

Shorter wavelength

X -rays

Gama rays

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

The magnifying power of a convex lens of focal length 5 cm is

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3

5

6

20

Which type of image is produced by the converging lens of human eye if it views a distant object.

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Real, erect, same size

Real, inverted, diminished

Virtual, erect, diminshed

Virtual, inverted, magnified

When a ray of light traveling in a rare medium enters into a denser medium

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It remains undeviated

It is reflected back

It bends towards the normal

It bends away from the normal

The point midway between the lens surface on its participial axis

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Optical centre

Principal focus

Focal plane

Focal length

The refractive index of benzenes is 1.5 What is the critical angle of benzene.

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0.667 ^o

42 ^o

48^o

90^o

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

Which one of the following telescopes has the least length when set for parallel rays.

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Astronomical telescope

Galileo's telescope

Terrestrial telescope

Reflecting telescope

A ray of light from air into glass The angle of incidence is 30o if the refractive index of glass in 1.52 The angle of refraction will be.

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16.7 ^o

19.3 ^o

29.6 ^o

39.3 ^o

In a compound microscope objective lens acts as a projector and eye place as a

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Compensator

Erecting lens

Simple microscope lens

Turntable

Light entering glass will not suffer change in

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Frequency

wavelength

Speed

Direction

Light entering glass will not suffer change in

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Wavelength

Direction

Velocity

Frequency

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 light enters a denser medium

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Its speed slows down

Its speed increases

It is totally reflected

Its speed remains unchanged

The ability's of convex lens to produce convergence in a parallel beam is called its.

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Magnification

Focal length

Power

Strength

Refraction contributes to the formation of.

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Rainbows only

Mirages only

Echo

Rainbows and mirages

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