Question # 1

An image formed on the film of camera is

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Real , inverted and diminshed

Virtual, inverted and diminshed

Real upright and diminished

Virtual, upright and idminshed

A convex mirror is used to reflect light from an object placed 66 cm in front of the mirror. The focal length of the mirror is 46 cm Find the location of the image.

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23 cm

-23 cm

-27 cm

27 cm

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 critical angle will be maximum when light travels from

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Glass of air

Water to air

Water to glass

Glass to water

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

The point midway between the lens surface on its participial axis

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Optical centre

Principal focus

Focal plane

Focal length

When the angel of incidence becomes larger than the critical angle no refraction occurs This is known is.

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Diffraction

Refraction

Total internal reflection

Diffuse reflection

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

Power of the lens is one dioptre, if its focal length is.

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1/6 metre

1/2 metre

1 metre

8 metre

Reciprocal of the focal length is called.

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Radios of curvature of the lens

Power of the lens

Aperture of the lens

Resolving power

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 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

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

Light entering glass will not suffer change in

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Wavelength

Direction

Velocity

Frequency

use of outer layer in optical fires called cladding is mainly to.

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Scatter thelight

Absorb unwanted light

Transmit the light

Produce total internal reflection

Which part of hole located in the centre of the eye that allows light to enter the retina.

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Iris

Pupil

Cornea

Fovea

Michelson used the equation to determine the speed of light.

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c = 4 fd

c = 8fd

c =12 fd

c = 18 fd

In optics, which subfield studies the measurement of electromagnetic radiation including visible light.

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Radiometry

Photometry

Telemetry

Chronometry

To get large magnifying power of an astronomical telescope. we should have focal length of eye lens.

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Small

Large

Of any value

Infinity

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

Linear magnification is equal to the ratio of.

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Size of the object to the size of the image

Size of the image to the size of the object

size of the object focal length

Size of the image focal length

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