Ray Optics Test

Result

Ray Optics Test - 25

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Weekly Quiz Competition

Question 1
4 / -1

A prism of angle 30° is silvered at one side. A ray of light incident at an angle 45° is reflected back from the silvered surface. The refractive index is

A

B

C

D
Question 2
4 / -1

A wire mesh consisting of very small squares is viewed at a distance of 8 cm through a magnifying converging lens of focal length 10 cm, kept close to the eye. The magnification produced by the lens is

A
5

B
8

C
10

D
20
Question 3
4 / -1

A lens is made of flint glass (refractive index = 1.5). When the lens is immersed in a liquid of refractive index 1.25, the focal length

A
increase by a factor of 1.25

B
increases by a factor of 2.5

C
increases by a factor of 1.2

D
decreases by a factor of 1.2
Question 4
4 / -1

White light is incident on one of the refracting surfaces of a prism of angle 5°. If the refractive indices for red and blue colours are 1.641 and 1.659 respectively, the angular separation between these two colours when they emerge out of the prism is

A
0.9°

B
0.09°

C
1.8°

D
1.2°
Question 5
4 / -1

For a given lens, the magnification was found to be twice as large as when the object was 0 15 m distant from it as when the distance was 0.2 m. The focal length of the lens is

A
1.5 m

B
0.20 m

C
0.10 m

D
0.05 m
Question 6
4 / -1

A thin prism P₁ with angle 4° made from a glass refractive index 1.54 is combined with another thin prism P₂ made from glass of refractive index 1.72 to produce dispersion without deviation. The angle of the prism P₂ is

A
5.33°

B
4°

C
3°

D
2.6°
Question 7
4 / -1

A ray of light incident normally on one face of a right angled isoscales prism. It them grazes the hypotenuse. The refractive index of the material of the prism is

A
1.33

B
1.414

C
1.5

D
1.732
Question 8
4 / -1

A prism of a certain angles deviates the red and blue rays by 8° and 12° respectively. Another prism of the same angle deviates the red and blue rays by 10°, respectively. The prisms are small angled and made of different materials. The dispersive powers of the materials of the prisms are in the ratio

A
5 : 6

B
9 : 11

C
6 : 5

D
11 : 9
Question 9
4 / -1

A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principle axis. If the power of the original lens is 4D, the power of a cut lens will be

A
2D

B
3D

C
4D

D
5D
Question 10
4 / -1

A convex lens is placed between object and a screen. The size of object is 3 cm and an image of height 9 cm is obtained on the screen. When the lens is displaced to a new position, what will be the size of image on the screen?

A
2 cm

B
6 cm

C
4 cm

D
1 cm