Ray Optics Test

Result

Ray Optics Test - 18

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Weekly Quiz Competition

Question 1
4 / -1

A point object O is placed in front of a glass rod having spherical end of radius of curvature 30 cm. The image would be formed at

A
30 cm left

B
infinity

C
1 cm to the right

D
18 cm to the left
Question 2
4 / -1

A boat has green light of wavelength λ= 500 nm on the mast. What wavelength would be measured and what colour would be observed for this light as seen by a diver submerged in water by the side of the boat?

A
Green of wavelength 376 nm

B
Red of wavelength 665 nm

C
Green of wavelength 500 nm

D
Blue of wavelength 376 nm
Question 3
4 / -1

A ball is dropped from a height of 20 m above the surface of water in a lake. The refractive index of water is 4/3. A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is 12.8 m above the water surface, the fish sees the speed of ball as

A
9 ms^-1

B
12 ms^-1

C
16 ms^-1

D
21.33 ms^-1

Solution
Question 4
4 / -1

A ray of light falls on a transparent glass slab of refractive index 1.62. If the reflected ray and the refracted ray are mutually perpendicular, the angle of incidence is

A

B

C

D
Question 5
4 / -1

A ray of light strikes a material's slab at an angle of incidence 60°. If the reflected and refracted rays are perpendicular to each other, the refractive index of the materials is

A

B

C

D
Question 6
4 / -1

Light travels with a speed of 2 ×10⁸ ms^-1 in crown glass of refractive index 1.5. What is the speed of light in dense flint glass of refractive index 1.8?

A
1.33 × 10⁸ ms^-1

B
1.67 × 10⁸ ms^-1

C
2.0 × 10⁸ ms^-1

D
3.0 × 10⁸ ms^-1

Solution
Question 7
4 / -1

A point source of light is placed 4 m below the surface of water of refractive index 5/3. The minimum diameter of a disc, which should be placed over the source, on the surface of water to cut-off all light coming out of water is

A
infinite

B
6 m

C
4 m

D
3 m

Solution
Question 8
4 / -1

A

B

C

D

Solution
Question 9
4 / -1

A ray of light is incident at the glass-water interface at an angle i it emerges finally parallel to the surface of water, then the value of μ_g would be

A
(4/3) sin i

B
1/sin i

C
4/3

D
1
Question 10
4 / -1

A fish in water (refractive index n) looks at a bird vertically above in the air. If y is the height of the bird and x is the depth of the fish from the surface, then the distance of the bird as estimated by the fish is

A

B
x + ny

C

D