Ray Optics Test

Result

Ray Optics Test - 115

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Weekly Quiz Competition

Question 1
4 / -1

A ray of light makes an angle of 10° with the horizontal above it and strikes a plane mirror which is inclined at an angle θ to the horizontal. The angle 0 for which the reflected ray becomes vertical is

A
40°

B
50°

C
80°

D
100°

Solution
Question 2
4 / -1

A thin rod of 5cm length is kept along the axis of a concave mirror of 10cm focal length such that its image is real and magnified and one end touches the rod. Its magnification will be

A
1

B
2

C
3

D
4

Solution
Question 3
4 / -1

A telescope using light having wavelength 5000 Åand using lenses of focal 2.5 and 30 cm. If the diameter of the aperture of the objective is 10 cm, then the resolving limit and magnifying power of the telescope is respectively

A
6.1 × 10^–6 rad and 12

B
5.0 × 10^–6 rad and 12

C
6.1 × 10^–6 rad and 8.3 × 10^–2

D
5.0 × 10^–6 rad and 8.3 × 10^–2

Solution
Question 4
4 / -1

A lens when placed on a plane mirror then object needle and its image coincide at 15 cm. The focal length of the lens is

A
15 cm

B
30 cm

C
20 cm

D
∞

Solution
Question 5
4 / -1

When sunlight is scattered by minute particles of atmosphere, the intensity of light scattered away isproportional to

A
(wavelength of light) ⁴

B
(frequency of light) ⁴

C
(wavelength of light) ^–2

D
(frequency of light) ²
Question 6
4 / -1

A thick plane mirror shows a number of images of the filament of an electric bulb. Of these, the brightest image is the

A
First

B
Second

C
Fourth

D
Last

Solution
Question 7
4 / -1

A man is 180 cm tall and his eyes are 10 cm below the top of his head. In order to see his entire height right from toe to head, he uses a plane mirror kept at a distance of lm from him. The minimum length of theplane mirror required is

A
180 cm

B
90 cm

C
85 cm

D
170 cm

Solution
Question 8
4 / -1

A person is in a room whose ceiling and two adjacent walls are mirrors. How many images are formed?

A
5

B
6

C
7

D
8

Solution
Question 9
4 / -1

A plane mirror makes an angle of 30° with horizontal. If a vertical ray strikes the mirror, find the angle between mirror and reflected ray

A
30°

B
45°

C
60°

D
90°

Solution
Question 10
4 / -1

A watch shows time as 3 : 25 when seen through amirror, time appeared will be

A
8 : 35

B
9 : 35

C
7 : 35

D
8 : 25

Solution