Wave Optics Test

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Wave Optics Test - 18

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Weekly Quiz Competition

Question 1
1 / -0

The phenomenon by which stars recedes from each other is explained by

A
black hole theory

B
neutron star theory

C
white dwarf

D
red shift

Solution

When an object moves away from us, its light waves are stretched into lower frequencies or longer wavelengths, and we say that the light is redshifted. It also explain the expanding nature of universe.
Doppler effect in light explains the phenomenon of receding of stars and approaching of star by red shift and blue shift respectively.
Question 2
1 / -0

Which of the following properties shows that light is a transverse wave?

A
Reflection

B
Interference

C
Diffraction

D
Polarization

Solution

The polarization phenomenon, verifies the transverse nature of light. Since sound has longitudinal nature, so it does not show polarization effect.
Question 3
1 / -0

The transverse nature of light is shown by

A
interference of light

B
refraction of light

C
polarization of light

D
dispersion of light

Solution

Polarisation of light establishes that light are transverse in nature, otherwise it was believed that they are longitudinal waves, like the sound waves.
Question 4
1 / -0

Ray optics is valid when characteristic dimensions are

A
of the same order as the wavelength of light

B
much smaller than the wavelength of light

C
much larger than the wavelength of light

D
of the order of 1 mm

Solution

Ray optics is valid when characteristics dimensions are larger than the wavelength of the light, so that rectilinear property of light can be used.
Question 5
1 / -0

In case of an astronomical telescope, the distance between the objective lens and the eyepiece is equal to :
(final image is at $$\displaystyle \infty $$)

A
$$\displaystyle { f }_{ o }+{ f }_{ e }$$

B
$$\displaystyle { f }_{ o }-{ f }_{ e }$$

C
$$\displaystyle \frac { { f }_{ o } }{ { f }_{ e } } $$

D
$$\displaystyle \frac { { f }_{ e } }{ { f }_{ o } } $$

Solution

As seen in diagram the distance between the objective lens and the eyepiece is equal to $$f_0+f_e$$
Question 6
1 / -0

Two lenses of focal lengths $$+ 100 cm$$ and $$+ 5 cm$$ are used to prepare an astronomical telescope. The minimum tube length will be : (final image is at $$\displaystyle \infty $$)

A
$$95 cm$$

B
$$100 cm$$

C
$$105 cm$$

D
$$500 cm$$

Solution

the length of telescope =focal length of object $$(-f_0)$$ +focal length of eyepiece $$(f_e)$$$$=100+5=105cm$$
Question 7
1 / -0

In optical instruments, the lenses are used to form images by :

A
Reflection

B
Refraction

C
Dispersion

D
Scattering

Solution

In optical instruments, the lenses are used to form images by Refraction.
Question 8
1 / -0

Choose the correct option about light.

A
Light requires a material medium to travel from one place to another

B
Light does not require a material medium to propagate

C
Light has mass but it is negligible

D
Light waves are longitudinal wave

Solution

Light does not need medium to travel. Its an electromagnetic wave. All electromagnetic waves travel independent of medium.
Question 9
1 / -0

In which of the following the final image is erect?

A
Compound microscope

B
Astronomical telescope

C
Simple microscope

D
All of the above

Solution

The image formed by the Compound microscope and Astronomical telescope is inverted,but in case of Simple microscope it form erect image.
Question 10
1 / -0

The ratio of maximum and minimum intensities in an interference pattern is 36 : 1. The ratio of the amplitudes of the two interfering waves will be

A
5 : 7

B
7 : 4

C
4 : 7

D
7 : 5

Solution

$$\displaystyle \frac{I_{max}}{I_{min}} = \frac{36}{1}$$
$$\Rightarrow \displaystyle \frac{(a + b)^2}{(a - b )^2} = \frac{36}{1}$$
$$\Rightarrow \displaystyle \frac{a + b}{a - b} = \frac{6}{1}$$
$$\Rightarrow a + b = 6a -6b$$
$$\Rightarrow \displaystyle 5 a = 7b \Rightarrow \frac{a}{b} = \frac{7}{5}$$
$$ a : b = 7 : 5$$

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Re-Attempt Weekly Quiz Competition

Wave Optics Test - 18

Result

Wave Optics Test - 18

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SHARING IS CARING

Question 1

black hole theory

neutron star theory

white dwarf

red shift

Solution

Question 2

Reflection

Interference

Diffraction

Polarization

Solution

Question 3

interference of light

refraction of light

polarization of light

dispersion of light

Solution

Question 4

of the same order as the wavelength of light

much smaller than the wavelength of light

much larger than the wavelength of light

of the order of 1 mm

Solution

Question 5

$$\displaystyle { f }_{ o }+{ f }_{ e }$$

$$\displaystyle { f }_{ o }-{ f }_{ e }$$

$$\displaystyle \frac { { f }_{ o } }{ { f }_{ e } } $$

$$\displaystyle \frac { { f }_{ e } }{ { f }_{ o } } $$

Solution

Question 6

$$95 cm$$

$$100 cm$$

$$105 cm$$

$$500 cm$$

Solution

Question 7

Reflection

Refraction

Dispersion

Scattering

Solution

Question 8

Light requires a material medium to travel from one place to another

Light does not require a material medium to propagate

Light has mass but it is negligible

Light waves are longitudinal wave

Solution

Question 9

Compound microscope

Astronomical telescope

Simple microscope

All of the above

Solution

Question 10

5 : 7

7 : 4

4 : 7

7 : 5

Solution

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