Ray Optics Test

Result

Ray Optics Test - 133

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Weekly Quiz Competition

Question 1
4 / -1

In the formation of primary rainbow, the sunlight rays emerge at minimum deviation from rain-drop after

A
One internal reflection and one refraction

B
One internal reflection and two refractions

C
Two internal reflections and one refraction

D
Two internal reflections and two refractions
Question 2
4 / -1

Dispersive power depends upon

A
The shape of prism

B
Material of prism

C
Angle of prism

D
Height of the prism
Question 3
4 / -1

When white light passes through the achromatic combination of prisms, then what is observed

A
Only deviation

B
Only dispersion

C
Deviation and dispersion

D
None of the above
Question 4
4 / -1

The dispersion for a medium of wavelength λ is D, then the dispersion for the wavelength 2λ will be

A
D/8

B
D/4

C
D/2

D
D

Solution
Question 5
4 / -1

The refractive index of a prism for a monochromatic wave is √2 and its refracting angle is 60°. For minimum deviation, the angle of incidence will be

A
30°

B
45°

C
60°

D
75°

Solution
Question 6
4 / -1

The ratio of angle of minimum deviation of a prism in air and when dipped in water will be (_aµ_g = 3 / 2 and _aµ_w = 4/ 3)

A
1/8

B
1/2

C
3/4

D
1/4

Solution
Question 7
4 / -1

The respective angles of the flint and crown glass prisms are A\' and A. They are to be used for dispersion without deviation, then the ratio of their angles A\'/ A will be

A

B

C

D

Solution
Question 8
4 / -1

The no. of wavelengths in the visible spectrum

A
4000

B
6000

C
2000

D
Infinite
Question 9
4 / -1

The black lines in the solar spectrum during solar eclipse can be explained by

A
Planck's law

B
Kirchoff's law

C
Boltzmann's law

D
Solar disturbances
Question 10
4 / -1

The dispersive power is maximum for the material

A
Flint glass

B
Crown glass

C
Mixture of both

D
None of these