Ray Optics Test

Result

Ray Optics Test - 36

Score
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Weekly Quiz Competition

Question 1
4 / -1

A fish 10 cm long is 4 cm under the water level. Its length when viewed vertically above will be

A
10 cm

B
3 cm

C
7.5 cm

D
8 cm
Question 2
4 / -1

A well cut diamond appears bright because

A
It emits light

B
It is radioactive

C
of total internal reflection

D
It has high density
Question 3
4 / -1

A ray of light travelling inside a rectangular glass block of refractive index √2 is incident on the glass-air surface at an angle of incidence of 45º. The refractive index of air is one. Under these conditions, the ray

A
will emerge into the air without any deviation

B
will be reflected back into the glass

C
will be absorbed

D
will emerge into the air with an angle of refraction equal to 90º

Solution
Question 4
4 / -1

A ray of light passes from vacuum into a medium of refractive index µ, the angle of incidence is found to be twice the angle of refraction. Then the angle of incidence is

A
cos^–1 (µ/2)

B
2cos^–1 (µ/2)

C
2sin^–1 (µ)

D
2sin^–1 (µ/2)

Solution
Question 5
4 / -1

A convex lens of focal length f produces a real image n times the size of an object, then the distance of the object from the lens is

A
(n – 1) f

B
(n + 1) f

C

D

Solution
Question 6
4 / -1

An object is placed at a distance of f/2 from a convex lens. The image will be

A
at one of the foci, virtual and double its size

B

C
at 2f, virtual and erect

D
at f, real and inverted

Solution
Question 7
4 / -1

A lens of power +2 diopter is placed in contact with a lens of Power -1 diopter. The combination will behave like

A
a convergent lens of focal length 50 cm

B
a divergent lens of focal length 100 cm

C
a convergent lens of focal length 100 cm

D
a convergent lens of focal length 200 cm

Solution
Question 8
4 / -1

A convex lens of crown glass (µ = 1.525) will act as a diverging lens if it is immersed in

A
water (µ = 1.33)

B
medium (µ = 1.525)

C
carbon disulfide (µ = 1.66)

D
None of the above
Question 9
4 / -1

A ray of light, incident on one face of an equilateral prism undergoes total internal reflection at another face. If the refractive index of the material of prism is √2 , then angle of refraction (r₂) at another face will be

A
15^o

B
30^o

C
45^o

D
sin^-1(√2 sin 15^o)

Solution
Question 10
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 source, on surface of water to cut off all light coming out of water is

A
1 m

B
4 m

C
3 m

D
6 m

Solution