Question # 1

When a ray light is incident at anacute angle to the boundary of the media the refracted ray.

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Bends away from the normal

Bends towards the normal

Remains undedicated

Is totally reflected

a spectrometer is used to study

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Spectrum

Waveform

Interference

Diffraction

A double convex an bubble in water will behave as.

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Plane slab

Concave mirror

Convex lens

Concave lens

Human's eye acts like a

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LASER

Mirror

Lens

Fibre optics

The band of colours is called.

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Spectrum

Prism

Medley

LASER

A diverging lens may not have

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Negative focal length

Positive focal length

One plane surface

One convex surface

Telecommunication by Optical fibers is done by

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Single mode step index fibre

Multimode step index fibre

Multimode graded index fibre

All of the above

The point midway between the lens surface on its participial axis

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Optical centre

Principal focus

Focal plane

Focal length

A pencil dipped partially into water appears bent because of.

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Reflection of water surface

Diffraction of water surface

Refraction of water surface

Water is a fluid

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

In compound microscope image formed by the eyepiece is

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Real

Inverted

erect

diminished

Which statement about the image formed by a convex lens is correct.

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It is always real and eruct

It is always real and inverted

It is always virtual and erect

It may be either virtual or real

Which is the branch of medicine that deals with the anatomy physiology and diseases of the eye.

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Ophthalmology

Psychology

Andrology

Gynecology

An object is -14 cm in front of a convex mirror The image 5.8 cm behind the mirror. What is the focal length of the mirror.

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-4.1 cm

-8.2 cm

- 9.9 cm

-20 cm

A negative magnification always means the the image is.

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Erect

Real

Virtual

Inverted

In case of a convex lens, image formed at 2 F is

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Virtual, erect and larger than the object

Real, inverted and large than the object

Real, inverted and same size as the object

Real, inverted and smaller than the object

The resolving power of an instrument increases as the wavelength of light used decreases, the magnifying power will

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Remain the same

Increases

Decreases

Have no relation between the two

A double convex lens acts as diverging lens when the object is.

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Inside the focus

At the focus

Between F and 4 F

a 4F

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

The line passing symmetrically though the optical center of the lens is.

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Focal plane

Principal focus

Principal axis

Focal length

Which of the following quantities is not changed during refraction of light.

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Its direction

Its speed

Its frequency

Its wavelength

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