Question # 1

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

Lenses are commonly made of.

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Glass only

Plastic only

Glass and clear plastic

Aluminium

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 depth of a pond is 4 m What is the apparent depth of the pond if the water level is 3.5 m high. The refractive index of water is 1.33

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1.9 m

2.3 m

3.13 m

4.5 m

The maximum number of rays required by a lens to form an image are

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2

3

4

Infinite

Which of the following colours of light passes through glass with minimum speed.

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Green

Yellow

Red

Violet

The aberration in the image formed by a lens due to different wavelengths present in a source is called.

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Spherical aberration

Chromatic aberration

Astigmation

Achromatic aberration

In compound microscope image formed by the eyepiece is

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Real

Inverted

erect

diminished

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

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Unidirectional

Cohernet

Monochromatic

Not absorbed

The critical angle for a beam of light passing from water into air is 48.8 o This mean that all light rays with an angle of incidence greater than this angle will be.

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Absorbed

Totally reflected

Partially reflected and partially transmitted

Totally transmitted

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

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Prism

Lens

Plane mirror

Grating

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

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

Larger the diameter of the objective of a telescope.

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Greater is its resolving power

Lesser is its resolving power

Lesser is its magnifying power

greater is its magnifying power

The final image produced by a microscope is.

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Real and erect

Virtual and erect

Real and inverted

Virtual and inverted

Two convex lens focal length 'f' use din combination become telescope. When the distance between them is.

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1

4f

2f

f/2

The minimum angle of incidence for which total internal reflection can occur is called.

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Right angle

Acute angle

Critical angle

Obtuse angle

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

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

Why danger signals are made red.

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Our eyes are more sensitive to real colour

Red colour has minimum scattering

Red colour has maximum scattering

Red colour has maximum frequency

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