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Two point white dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which these dots can be resolved by the eye? [ Take wavelength of light = 500 mm ]

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Important Questions on Wave Optics

EASY

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

Assume that the light of wavelength is

6000 \overset{\circ}{A}

coming from a star. What is the resolution limit of a telescope whose objective has a diameter of

100

inch?

HARD

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

Assuming that the human pupil has a radius of

0.25 cm

and a comfortable viewing distance of

25 cm

. The minimum separation between two point objects that the human eye can resolve for the light of wavelength

500 nm

EASY

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

Two poles are separated by a distance of

3.14 m

The resolving power of human eye is

1

minute of an arc. The maximum distance from which he can identify the two poles distinctly is

EASY

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

If the wavelength of light used is

6000 Å .

The angular resolution of the telescope of an objective lens having diameter

10 cm

is _____

rad

EASY

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

Calculate the limit of resolution of a telescope objective having a diameter of

200 c m

, if it has to detect light of wavelength

500 n m

coming from a star.

EASY

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

The speed of electrons in a scanning electron microscope is

1 \times 10^{7} {ms}^{- 1}

. If the protons having the same speed are used instead of electrons, then the resolving power of scanning proton microscope will be changed by a factor of:

MEDIUM

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

Assume that light of wavelength

600 nm

is coming from a star. The limit of resolution of telescope whose objective has a diameter of

2 m

is:

MEDIUM

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

Larger aperture of objective lens in an astronomical telescope _____

EASY

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

Diameter of the objective lens of a telescope is

250 c m .

For light of wavelength

600 n m

coming from a distant object, the limit of resolution of the telescope is close to:

EASY

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

The value of numerical aperture of the objective lens of a microscope is

1.25 .

If light of wavelength

5000 \overset{\circ}{A}

is used, the minimum separation between two points, to be seen as distinct, will be:

EASY

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

On decreasing the wavelength of incident light from

8000 \overset{\circ}{A}

4000 \overset{\circ}{A}

, the intensity of the scattered light in Rayleigh scattering will become how many times the initial scattered intensity?

EASY

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

The diameter of the objective lens of the microscope makes an angle

β

at the focus of the microscope. Further, the medium between the object and the lens is the oil of the refractive index

n

. Then the resolving power of the microscope.

EASY

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

A telescope has an objective lens of

10 cm

diameter and is situated at a distance

1 km

from two objects. The minimum distance between these two objects which can be resolved by the telescope, when the mean wavelength of the light is

5000 \overset{o}{A}

, is of the order of

EASY

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : An electron microscope can achieve better resolving power than an optical microscope.

Reason R : The de Broglie's wavelength of the electrons emitted from an electron gun is much less than wavelength of visible light.

In the light of the above statements, choose the correct answer from the options given below:

HARD

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

An LED display consists of

100

pixels per

{cm}^{2} .

Consider that the diameter of the pupil of the eye is

5 mm

and the average wavelength of the display is

575 nm .

What is the nearest distance from the display one can be at, such that the display does not appear pixelated?

MEDIUM

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

Light of wavelength $6000 \overset{\circ}{A}$ is coming from a star. What is the limit of resolution of a telescope whose objective has a diameter of $100 inch$ ?

MEDIUM

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

Which device is used to measure the power of lens?

MEDIUM

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

The aperture diameter of a telescope is

5 m

. The separation between the moon and the earth is

4 \times 10^{5} k m

. With light of wavelength of

5893 Å

, the minimum separation between objects on the surface of moon, so that they are just resolved, is close to:

HARD

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

Two stars are 10 light years away from the earth. They are seen through a telescope of objective diameter 30 cm. The wavelength of light is 600nm. To see the stars just resolved by the telescope, the minimum distance between them should be

(1 l i g h t y e a r = 9.46 \times 10^{15} m)

of the order of :

EASY

Physics>Optics>Wave Optics>Resolving Power and Resolving Limit

The ratio of resolving powers of an optical microscope for two wavelengths

λ_{1} = 4000 Å

and

λ_{2} = 6000 Å

Two point white dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which these dots can be resolved by the eye? [ Take wavelength of light = 500 mm ]

Important Questions on Wave Optics

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