Question # 1

A person of height 1.5 m stands 2.0 m in front of a plane mirror How far from the person is her image .

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2.0 m

3.0 m

3.5 m

4.0 m

The power of convex lens is 10 d. At what distance the 3 times larger image is formed.

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9.6 cm

2.3 cm

13.3 cm

17.6 cm

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

The bending of light when it enters a medium

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Reflection

Refraction

Diffraction

Total internal reflection

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

A bi convex lens of a material of refractive index 1.5 has the radius of curvature of each side equal to 50 cm the power of the lens will be.

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0.5 dipotre

1.0 dioptre

1.5 diopter

2.0dioptre

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

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f

2f

f/2

zero

In case of a convex lens when object is placed at 2F image is formed.

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At

2F

away from 2F

Between F at and 2 F

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 of the following are defects in human eye.

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Myopia

Hypermetropia

Presbyopia

All of these

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

Which instrument measures the magnification of a telescope.

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lactometer

dynamometer

Wattmeter

Ammeter

Which parameter is an indication of colour of a star.

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Weight

Distance

Sixe

Temperature

A convex lens of focal length 6 cm to be used to from a virtual image three times the size of the object Where must the lens be placed.

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1 cm

2 cm

3 cm

4 cm

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

To final image produced by a compound microscope is.

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Real and inverted

Real and erect

Virtual and erect

Virtual and inverted

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

Which is the thick circular structure in teh eye containing an aperture with variable diameter It controls the amount of light reaching the retina.

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Retina

Iris

Pupil

Cornea

A component of the spectrometer which consists of a fixed metallic tube with a coned lens at one end and an adjustable slit is called.

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Telescope

Collimator

Tumtable

Grating

Which is the light sensitive tissue in human eye

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Retina

pupil

Iris

Cornea

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

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Green

Yellow

Red

Violet

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