Ray Optics Test

Result

Ray Optics Test - 80

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Weekly Quiz Competition

Question 1
4 / -1

Angle of prism is A and its one surface is silvered. Light rays falling at an angle of incidence 2A on first surface return back through the same path after suffering reflection at second silvered surface. Refractive index of the material of prism is

A
2 sin A

B
2 cos A

C
1/2 cos A

D
tan A

Solution
Question 2
4 / -1

A ray of light incident normally on an isosceles right angled prism travels as shown in the figure. The least value of the refractive index of the prism must be

A
√2

B
√3

C
1.5

D
2.0

Solution
Question 3
4 / -1

When seen in green light, the saffron and green portions of our National Flag will appear to be

A
Black

B
Black and green respectively

C
Green

D
Green and yellow respectively
Question 4
4 / -1

At sun rise or sunset, the sun looks more red than at mid-day because

A
The Sun is hottest at these times

B
Of the scattering of light

C
Of the effects of refraction

D
Of the effects of diffraction
Question 5
4 / -1

Line spectrum contains information about

A
The atoms of the prism

B
The atoms of the source

C
The molecules of the source

D
The atoms as well as molecules of the source
Question 6
4 / -1

Missing lines in a continuous spectrum reveal

A
Defects of the observing instrument

B
Absence of some elements in the light source

C
Presence in the light source of hot vapors of some elements

D
Presence of cool vapors of some elements around the light source
Question 7
4 / -1

A source emits light of wavelength 4700 Å, 5400 Åand 6500 Å. The light passes through red glass before being tested by a spectrometer. Which wavelength is seen in the spectrum

A
6500 Å

B
5400 Å

C
4700 Å

D
All the above
Question 8
4 / -1

When light of wavelength λ, is incident on an equilateral prism kept in its minimum deviation position, it is found that the angle of deviation equals the angle of the prism itself. The refractive index of the material of the prism for the wavelength λ is, then

A

B

C
2

D

Solution
Question 9
4 / -1

Which of the following diagrams shows correctly the dispersion of white light by a prism

A

B

C

D
Question 10
4 / -1

A neon sign does not produce

A
Line spectrum

B
An emission spectrum

C
An absorption spectrum

D
Photons