Ray Optics Test

Result

Ray Optics Test - 123

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Weekly Quiz Competition

Question 1
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 2
4 / -1

If the critical angle for total internal reflection from a medium to vacuum is 30°, the velocity of light in the medium is

A
3 × 10⁸ m/s

B
1.5 × 10⁸ m/s

C
6 × 10⁸ m/s

D

Solution
Question 3
4 / -1

A ray of light is incident at an angle i from denser to rare medium. The reflected and the refracted rays are mutually perpendicular. The angle of reflection and the angle of refraction are respectively r and r\', then the critical angle will be

A

B

C

D

Solution
Question 4
4 / -1

A diver at a depth of 12 m in water (µ = 4/3) sees the sky in a cone of semi-vertical angle

A
sin^–1 (4/3)

B
tan^–1 (4/3)

C
sin^–1 (3/4)

D
90°

Solution
Question 5
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 6
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
Question 7
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
θλ₁ / λ₂

Solution
Question 8
4 / -1

\'Mirage\' is a phenomenon due to

A
Reflection of light

B
Refraction of light

C
Total internal reflection of light

D
Diffraction of light
Question 9
4 / -1

The speed of light in media M₁ and M₂ is 1.5 × 10⁸ m/s and 2.0 × 10⁸ m/s respectively. A ray of light entersfrom medium M₁ to M₂ at an incidence angle i. If the ray suffers total internal reflection, the value of i is

A
Equal to sin^–1(2/3)

B
Equal to or less than sin^–1(3/5)

C
Equal to or greater than sin^–1(3/4)

D
Less than sin^–1(2/3)

Solution
Question 10
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