Ray Optics Test

Result

Ray Optics Test - 132

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Weekly Quiz Competition

Question 1
4 / -1

A biconvex lens has a radius of curvature of magnitude 20 cm. Which one of the following options describe best the image formed of an object of height 2 cm placed 30 cm from the lens

A
Real, inverted, height =1 cm

B
Virtual, upright, height =1 cm

C
Virtual, upright, height = 0.5 cm

D
Real, inverted, height = 4 cm

Solution
Question 2
4 / -1

When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index

A
Equal to that of glass

B
Less than one

C
Greater than that of glass

D
Less than that of glass

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

When white light passes through a glass prism, one gets spectrum on the other side of the prism. In the emergent beam, the ray which is deviating least is
or
Deviation by a prism is lowest for

A
Violet ray

B
Green ray

C
Red ray

D
Yellow ray

Solution
Question 5
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 6
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 7
4 / -1

Fraunhoffer lines are obtained in

A
Solar spectrum

B
The spectrum obtained from neon lamp

C
Spectrum from a discharge tube

D
None of the above
Question 8
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 9
4 / -1

Light from sodium lamp is passed through cold sodium vapours, the spectrum of transmitted light consists of

A
A line at 5890 Å

B
A line at 5896 Å

C
Sodium doublet lines

D
No spectral features
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