Ray Optics Test

Result

Ray Optics Test - 154

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Weekly Quiz Competition

Question 1
4 / -1

A thin rod of length f/3 lies along the axis of a concave mirror of focal length f. One end of its magnified image touches an end of the rod. The length of the image is

A
f

B
1/2 f

C
2f

D
1/4 f

Solution
Question 2
4 / -1

A ray of light falls on the surface of a spherical glass paper weight making an angle α with the normal and is refracted in the medium at an angle β. The angle of deviation of the emergent ray from the direction of the incident ray

A
(α–β)

B
2 (α– β)

C
(α –β)/2

D
(β–α)

Solution
Question 3
4 / -1

Light enters at an angle of incidence in a transparent rod of refractive index n. For what value of the refractive index of the material of the rod the light once entered into it will not leave it through its lateral face what soever be the value of angle of incidence

A

B

C

D

Solution
Question 4
4 / -1

A glass hemisphere of radius 0.04 m and RI. of the material 1.6 is placed centrally over a cross mark on a paper (i) with the flat face; (ii) with the curved face in contact with the paper. In each case the cross mark is viewed directly from above. The position of the images will be

A
(i) 0.04 m from the flat face; (ii) 0.025 m from the flat face

B
(i) At the same position of the cross mark; (ii) 0.025 m below the flat face

C
(i) 0.025 m from the flat face; (ii) 0.04 m from the flat face

D
For both (i) and (ii) 0.025 m from the highest point of the hemisphere

Solution
Question 5
4 / -1

One face of a rectangular glass plate 6 cm thick is silvered. An object held 8 cm in front of the first face, forms an image 12 cm behind the silvered face. The refractive index of the glass is

A
0.4

B
0.8

C
1.2

D
1.6

Solution
Question 6
4 / -1

An air bubble in sphere having 4 cm diameter appears 1 cm from surface nearest to eye when looked along diameter. If _aµ_g = 1.5, the distance of bubble from refracting surface is

A
1.2 cm

B
3.2 cm

C
2.8 cm

D
1.6 cm

Solution
Question 7
4 / -1

A convex lens A of focal length 20 cm and a concave lens B of focal length 5 cm are kept along the same axis with the distance d between them. If a parallel beam of light falling on Aleaves B as a parallel beam, then distance d in cm will be

A
25

B
15

C
30

D
50

Solution
Question 8
4 / -1

Diameter of a piano-convex lens is 6 cm and thickness at the centre is 3 mm. If the speed of light in the material of the lens is 2 × 10⁸ m/s, the focal length of the lens is

A
15 cm

B
20 cm

C
30 cm

D
10 cm

Solution
Question 9
4 / -1

A point object O is placed on the principal axis of a convex lens of focal length 20 cm at a distance of 40 cm to the left of it. The diameter of the lens is 10 cm. If the eye is placed 60 cm to the right of the lens at a distance h below the principal axis, then the maximum value of h to see the image will be

A
0

B
5 cm

C
2.5 cm

D
10 cm

Solution
Question 10
4 / -1

A luminous object is placed at a distance of 30 cm from the convex lens of focal length 20 cm. On the other side of the lens, at what distance from the lens a convex mirror of radius of curvature 10 cm be placed in order to have an upright image of the object coincident with it

A
12 cm

B
30 cm

C
50 cm

D
60 cm

Solution