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What are the parts of binoculars?

Important Questions on Human Eye and Optical Instruments

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Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

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:

EASY

Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

Two identical thin Plano-convex glass lenses (refractive index

1 .5

) each having radius of curvature of

20 cm

are placed with their convex surfaces in contact at the center. The intervening space is filled with oil of refractive index

1 .7

The focal length of the combination is

MEDIUM

Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

The magnifying power of a telescope with tube length

60 c m

5 .

What is the focal length of its eye piece?

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Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

In compound microscope, the focal length and aperture of the objective used is respectively

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Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

A person uses a handheld "magnifying glass" of focal length

f = 5 cm

to observe some very small print in a book. What is the typical angular magnification he can hope to get if the image is formed at infinity ?

EASY

Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

What is the magnifying power of a simple microscope of focal length

5 cm,

if the image is formed at the distance of distinct vision?

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Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

If we need a magnification of

375

from a compound microscope of tube length

150 m m

and an objective of focal length

5 m m,

the focal length of the eye-piece, should be close to:

HARD

Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

With a neat labelled diagram explain the formation of image in a simple microscope.

HARD

Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

A astronomical telescope has objective and eyepiece of focal lengths

40 cm

and

4 cm

respectively. To view an object

200 cm

away from the objective, the lenses must be separated by a distance:

EASY

Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

In an astronomical telescope in normal adjustment a straight black line of the length

L

is drawn on inside part of objective lens. The eye-piece forms a real image of this line. The length of this image is

l

. The magnification of the telescope is:

MEDIUM

Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

A telescope has an objective lens of focal length

150 cm

and an eyepiece of focal length

5 cm

. If a

50 m

tall tower at a distance of

1 km

is observed through this telescope in a normal setting, the angle formed by the image of the tower is

θ

, then

θ

is close to

MEDIUM

Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

An astronomical telescope has an objective lens of focal length

20 m

and an eyepiece of the focal length of

1 cm

. If this telescope is used to view the Moon, find the diameter of the image formed by the objective lens. Given the diameter of the Moon is

3.5 \times 10^{6}

m and the radius of the lunar orbit is

3.8 \times 10^{8}

MEDIUM

Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

A man suffering from defective vision cannot see objects clearly which is kept within

50 cm

from his eye. Predict, by calculation, the power of lens required to correct this effect.

MEDIUM

Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

An object is seen through a simple microscope of focal length

10 cm

. Find the angular magnification produced, if the image is formed at the near point of the eye which is

20 cm

away from it.

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Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

The value of distance $d$ so that final image is formed on the object itself is ___ .

Question Image

MEDIUM

Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

Represent the union of two sets by Venn diagram for each of the following.

$X = {x | x$ is a prime number between $80$ and $100}$

$Y = {y | y$ is an odd number between $90$ and $100}$

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Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

To increase the angular magnification of a simple microscope, one should increase

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Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

Question Image

Find linear magnification in the given diagram.

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Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

A telescope consists of two thin lenses of focal lengths 0.3 m and 3 cm respectively. It is focused on moon which subtends on angle of

0.5 °

at the objective. Then, the angle subtended at the eye by the final image will be

MEDIUM

Physics>Optics>Human Eye and Optical Instruments>Optical Instruments

The plane faces of two identical plano-convex lenses each having a focal length of

50 c m

are placed against each other to form a usual biconvex lens. The distance from this lens combination at which an object must be placed to obtain a real, inverted image which has the same size as the object is

What are the parts of binoculars?

Important Questions on Human Eye and Optical Instruments

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