Ray Optics Test

Result

Ray Optics Test - 63

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Weekly Quiz Competition

Question 1
4 / -1

With respect to air critical angle in a medium for light of red colour [λ₁] is θ. Other facts remaining same, critical angle for light of yellow colour [λ₂] will be

A
θ

B
More than θ

C
Less than θ

D

Solution
Question 2
4 / -1

When a ray of light emerges from a block of glass, the critical angle is

A
Equal to the angle of reflection

B
The angle between the refracted ray and the normal

C
The angle of incidence for which the refracted ray travels along the glass-air boundary

D
The angle of incidence
Question 3
4 / -1

A

B

C

D

Solution
Question 4
4 / -1

A point source of light is kept at a depth of h in water of refractive index 4/3. The radius of the circle at the surface of water through which light emits is

A

B

C

D

Solution
Question 5
4 / -1

A ray of light enters from a rarer to a denser medium. The angle of incidence is i. Then the reflected and refracted rays are mutually perpendicular to each other. The critical angle for the pair of media is

A
sin^–1 (cot i)

B
cos^–1 (tan i)

C
sin^–1 (tan i)

D
tan^–1 (sin i)

Solution
Question 6
4 / -1

The refractive index of water is 1.33. The direction in which a man under water should look to see the settingsun is

A
49° to the horizontal

B
90° with the vertical

C
49° to the vertical

D
Along the horizontal
Question 7
4 / -1

A light ray from air is incident (as shown in figure) at one end of a glass fiber (refractive index µ = 1.5 ) making an incidence angle of 60° on the lateral surface, so that it undergoes a total internal reflection. How much time would it take to traverse the straight fiber oflength 1 km

A
3.33 μs

B
6.67 μs

C
5.77 μs

D
3.85 μs

Solution
Question 8
4 / -1

A ray of light traveling in water is incident on its surface open to air. The angle of incidence is θ, which is less than the critical angle. Then there will be

A
Only a reflected ray and no refracted ray

B
Only a refracted ray and no reflected ray

C
A reflected ray and a refracted ray and the angle between them would be less than 180°–2θ

D
A reflected ray and a refracted ray and the angle between them would be greater than 180°– 2θ

Solution
Question 9
4 / -1

Consider telecommunication through optical fibres. Which of the following statements is not true

A
Optical fibres may have homogeneous core with a suitable cladding

B
Optical fibres can be of graded refractive index

C
Optical fibres are subject to electromagnetic interference from outside

D
Optical fibres have extremely low transmission loss.
Question 10
4 / -1

White light is incident on the interface of glass and air as shown in the figure. If green light is just totally internally reflected then the emerging ray in aircontains

A
Yellow, orange, red

B
Violet, indigo, blue

C
All colours

D
All colours except green

Solution