Ray Optics Test

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Ray Optics Test - 74

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Weekly Quiz Competition

Question 1
4 / -1

A bi-convex lens is formed with two thin piano-convex lenses as shown in the figure. Refractive index n of the first lens is 1.5 and that of the second lens is 1.2. Both the curved surfaces are of the same radius of curvature R = 14 cm. For this bi-convex lens, for an object distance of 40 cm, the image distance will be

A
–280.0 cm

B
40.0 cm

C
21.5 cm

D
13.3 cm

Solution
Question 2
4 / -1

An object 2.4 m in front of a lens forms a sharp image on a film 12 cm behind the lens. A glass plate 1 cm thick, of refractive index 1.50 is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object shifted to be insharp focus on film

A
7.2 m

B
2.4 m

C
3.2 m

D
5.6 m

Solution
Question 3
4 / -1

Which source is associated with a line emission spectrum

A
Electric fire

B
Neon street sign

C
Red traffic light

D
Sun
Question 4
4 / -1

Formula for dispersive power is (where symbols havetheir usual meanings)
or
If the refractive indices of crown glass for red, yellow and violet colours are respectively µ_r, µ_y and µ_v; then the dispersive power of this glass would be

A

B

C

D
Question 5
4 / -1

The critical angle between an equilateral prism and air is 45°. If the incident ray is perpendicular to the refracting surface, then

A
After deviation it will emerge from the second refracting surface

B
It is totally reflected on the second surface and emerges out perpendicularly from third surface in air

C
It is totally reflected from the second and third refracting surfaces and finally emerges out from the first surface

D
It is totally reflected from all the three sides of prism and never emerges out

Solution
Question 6
4 / -1

We use flint glass prism to disperse polychromatic light because light of different colours

A
Travel with same speed

B
Travel with same speed but deviate differently due to the shape of the prism

C
Have different anisotropic properties while travelling through the prism

D
Travel with different speeds
Question 7
4 / -1

A prism (μ = 1.5) has the refracting angle of 30°. The deviation of a monochromatic ray incident normally on its one surface will be (sin 48° 36\' = 0.75)

A
18° 36'

B
20° 30'

C
18°

D
22°1'

Solution
Question 8
4 / -1

Solar spectrum is an example for

A
Band absorption spectrum

B
Line absorption spectrum

C
Line emission spectrum

D
Continuous emission spectrum
Question 9
4 / -1

A spectrum is formed by a prism of dispersive power \'ω\'. If the angle of deviation is ‘δ’, then the angular dispersion is

A
ω /δ

B
δ/ ω

C
1/ ωδ

D
ωδ

Solution
Question 10
4 / -1

Angle of minimum deviation for a prism of refractive index 1.5 is equal to the angle of prism. The angle of prism is (cos 41° = 0.75)

A
62°

B
41°

C
82°

D
31°

Solution