Question # 1

The sun appears elliptical before sunset due to

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Reflection

Refraction

Scattering

Total internal reflection

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

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

Light entering glass will not suffer change in

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Wavelength

Direction

Velocity

Frequency

Total internal reflection occurs when the angle of incidence is.

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Greater than the angle of refraction

Equal to the critical angle

Greater than the critical angle

Greater than 45^o

In case of a convex lens, when object is placed at F

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the image is formed beyond 2 F

the image is formed between F and 2 F

No image is formed

the image is formed behind the object

The image of distant object as seen through as astronomical telescope is.

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Real and inverted

Virtual and inverted

Real and erect

Virtual and erect

An object of placed at the centre of curvature of a concave mirror The image produced by the mirror is located.

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Out beyond the centre of curvature

At the centre of curvature

Between the centre of curvature and the focal point

At the focal point

Colour of light is determined by its

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Amplitude

Velocity in air

Wavelength

State of polarization

In a magnifying glass, the objective is placed at a distance

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Less than the focal

Between the focal length and twice the focal length

Greater than twice the focal length

At the focus of the lens

The relation between angle of incidence and angle of refraction is known as.

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Snell's law

Refractive index

Index of refraction

All of the above

Due to which phenomenon, diamond shrines so brightly.

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Scattering of light

Refraction of light

Dispersion of light

Total internal reflection

Human's eye acts like a

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LASER

Mirror

Lens

Fibre optics

Any transparent medium bounded by one or two spherical surfaces is called

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Prism

Lens

Plane mirror

Grating

What is zoom lens

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It is a lens having fixed focal length

It is a lens having variable focal length

It is a lens used in radii to telescope

All of the above

A leser beam may be used to measure very large distance because it is.

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Unidirectional

Cohernet

Monochromatic

Not absorbed

Light rays after passing through is concave lens.

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Bend away from principal axis

Bend towards principal axis

Remain undeviated

Travel parallel to the principal axis

What is the focal length of a normal eye lens.

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1 mm

2 cm

25 cm

1 m

The length of Galilean telescope is given by

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fo + fe

fo- fe

1/fo - 1/fe

1/fo = 1/fe

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

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

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