Question # 1

When we decrease the diameter of the objective lens of a telescope the resolution of telescope

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Increases

Decreases

Remain the same

Depends upon the focal length of the lens

If D1 and D2 are the powers of two lenses placed in contact then the power of the combination will be.

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D1+D2

D1-D2

D1/D2

D1 x D2

Which of the following is used for reducing spherical aberrations in optical instruments.

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Plano convex lens

Concave lens

Spherical mirrors

Piane mirrors

The power of lens in dioptres is

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Its focal length in meters

The reciprocal of its focal length in metres

The reciprocal of length in metres

The reciprocal of length in centimetres

What is the type of corrective lens used to correct or enhance the vision is only one eye.

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Axicon

Monocle

Zoom lens

Camera lens

A part of electromagnetic spectrum that can be detected by the human aye

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Angle of incidence

Angle of refraction

Light

Angle of reflection

Dioptre is the term used for describing the

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Intensity of light

Density of air

Power of light

Refractive index

Which term is used for human eye deflect near sightedness.

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Myopia

Hypermetropia

Presbyopia

Calaract

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 bending of light when it enters a medium

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Reflection

Refraction

Diffraction

Total internal reflection

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 Fly is found to be sitting on a telescope when it is focused towards the moon What effect is expected on the photograph of the moon.

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Intensity remains unchanged

No effect

The complete field of view is blocked

Coloured image will be seen

When a ray of light is incident perpendicularly to the boundary of two media.

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It pass through without bending

It is speed is faster int he optically denser medium

It derivates from its original path

It is totally reflected back

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 the lens acts as a magnifying glass.

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5 cm

10 cm

15 cm

20 cm

a spectrometer is used to study

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Spectrum

Waveform

Interference

Diffraction

In water drops rainbows are formed by

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Reflection

Refraction

Dispersion

All of these

The function of collimator in spectrometer is to

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Disperse the light

Reflect the light

Make the light parallel

Diffract the light

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

If a ray of light in glass in incident on an air surface at an angle greater than the critical angle, the ray will

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Refract only

Reflect only

Partially refract and partially reflect

Diffract only

The blooming of the image due to dispersion in lenses is called.

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spherical aberration

Chromatic aberration

Astigmation

Curvature of image field

Two lenses of focal length 'f' are combined the resultant focal length is

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f

2f

f/2

zero

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