Ray Optics Test

Result

Ray Optics Test - 62

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Weekly Quiz Competition

Question 1
4 / -1

A diver in a swimming pool wants to signal his distress to a person lying on the edge of the pool by flashing his water proof flash light

A
He must direct the beam vertically upwards

B
He has to direct the beam horizontally

C
He has to direct the beam at an angle to the vertical which is slightly less than the critical angle of incidence for total internal reflection

D
He has to direct the beam at an angle to the vertical which is slightly more than the critical angle of incidence for the total internal reflection
Question 2
4 / -1

Finger prints on a piece of paper may be detected by sprinkling fluorescent powder on the paper and then looking it into

A
Mercury light

B
Sunlight

C
Infrared light

D
Ultraviolet light
Question 3
4 / -1

The wavelength of light in two liquids \'x\' and \'y\' is3500 Åand 7000 Å, then the critical angle of x relative to y will be

A
60°

B
45°

C
30°

D
15°

Solution
Question 4
4 / -1

A fish is a little away below the surface of a lake. If the critical angle is 49°, then the fish could see things above the water surface within an angular range of θ° where

A
θ = 49^o

B
θ = 90^o

C
θ = 98^o

D

Solution
Question 5
4 / -1

For total internal reflection to take place, the angle of incidence i and the refractive index μ of the medium must satisfy the inequality

A

B

C

D

Solution
Question 6
4 / -1

A transparent solid cylindrical rod has a refractive index of 2/√3.It is surrounded by air. A light ray is incident at the mid-point of one end of the rod as shown in the figure
The incident angle θ for which the light ray grazes along the wall of the rod is

A

B

C

D

Solution
Question 7
4 / -1

Total internal reflection of a ray of light is possible when the (i_c= critical angle, i = angle of incidence)

A
Ray goes from denser medium to rarer medium and i c

B
Ray goes from denser medium to rarer medium and i >i_c

C
Ray goes from rarer medium to denser medium and i >i_c

D
Ray goes from rarer medium to denser medium and i c
Question 8
4 / -1

Critical angle is that angle of incidence in the denser medium for which the angle of refraction in rarer medium is

A
0°

B
57°

C
90°

D
180°
Question 9
4 / -1

The critical angle for diamond (refractive index = 2) is

A
About 20°

B
60°

C
45°

D
30°

Solution
Question 10
4 / -1

The reason for shining of air bubble in water is

A
Diffraction of light

B
Dispersion of light

C
Scattering of light

D
Total internal reflection of light