Ray Optics Test

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Ray Optics Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Monochromatic light is incident on two slits 0.2 mm apart. If the first order bright fringe is 4.8 mm from the central bright spot on a screen located a distance of 1.5 m from the double slit, what is the wavelength of the light (in nm)?

A
485

B
640

C
640

D
852
Question 2
1 / -0

Light rays from a point object

A
Light rays from a point object

B
Light rays from a point object

C
radiate in some lines

D
radiate only at the front

Solution

light waves emerging from point source radiates in all the directions.
Question 3
1 / -0

The dispersive power of a material of lens of focal length 20 cm is 0.08. The longitudinal chromatic aberration of the lens is

A
0.08 cm

B
0.08/20 cm

C
0.016 cm

D
1.6 cm
Question 4
1 / -0

An electric bulb is suspended at a height h from the centre of a table having a surface of radius r. If the illuminance at the edge of the table is 1/8^th as that at the centre, then the height of the bulb in terms of r is

A
r/2

B
r/√2

C
r/√3

D
r/√7
Question 5
1 / -0

Light of wavelength 6500 Å is incident on a slit. If the first minima for red light is at 30^o, then the slit width is

A
1 x 10^-6 m

B
5.2 x 10^-6 m

C
1.3 x 10^-6 m

D
2.6 x 10^-6 m
Question 6
1 / -0

The minimum deviation produced by a glass prism having an angle of 60^o is 30^o. If the velocity of light in vacuum is 3 x 10¹⁰ cm/s, then what is its velocity in glass?

A
2.12 x 10¹⁰ cm/s

B
3.52 x 10¹⁰ cm/s

C
4.45 x 10¹⁰cm/s

D
5.32 x 10¹⁰ cm/s
Question 7
1 / -0

According to the mirror equation

A
(1/ f) = (2/u) + (1/v)

B
(1/ f) = (1/u) + (1/v)

C
(2/ f) = (2/u) + (1/v)

D
(1/ f) = (1/u) + (2/v)

Solution

where f is focal length, u is object distance and v is image distance.

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Re-Attempt Weekly Quiz Competition

Ray Optics Test - 2

Result

Ray Optics Test - 2

Score

-

Rank

-

SHARING IS CARING

Question 1

485

640

640

852

Question 2

Light rays from a point object

Light rays from a point object

radiate in some lines

radiate only at the front

Solution

Question 3

0.08 cm

0.08/20 cm

0.016 cm

1.6 cm

Question 4

r/2

r/√2

r/√3

r/√7

Question 5

1 x 10-6 m

5.2 x 10-6 m

1.3 x 10-6 m

2.6 x 10-6 m

Question 6

2.12 x 1010 cm/s

3.52 x 1010 cm/s

4.45 x 1010 cm/s

5.32 x 1010 cm/s

Question 7

(1/ f) = (2/u) + (1/v)

(1/ f) = (1/u) + (1/v)

(2/ f) = (2/u) + (1/v)

(1/ f) = (1/u) + (2/v)

Solution

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1 x 10^-6 m

5.2 x 10^-6 m

1.3 x 10^-6 m

2.6 x 10^-6 m

2.12 x 10¹⁰ cm/s

3.52 x 10¹⁰ cm/s

4.45 x 10¹⁰cm/s

5.32 x 10¹⁰ cm/s