A point source of light moves in a straight line parallel to a plane table

Question

A point source of light moves in a straight line parallel to a plane table

A point source of light moves in a straight line parallel to a plane table. Consider a small portion of the table directly below the line of movement of the source. The illuminance at this portion varies with its distance r from the source as

(a) I∝ 1/r

(b) I ∝ 1/r²

(c) I ∝ 1/r³

(d) I ∝ 1/r⁴

Monjur Alahi

5 views

2025-01-04 04:42

1 Answers

Related Questions

Which of the following can make a parallel beam of light when light from a point source is incident on it?

1 Answers 5 Views

In Question 4, point C is called a mid-point of line segment AB. Prove that every line segment has one and only one mid-point

1 Answers 4 Views

Paheli moves on a straight road from point A to point C. She takes 20 minutes to cover a certain distance AB

1 Answers 4 Views

A source of sound moves towards an observer. (a) The frequency of the source is increased.

1 Answers 4 Views

The inverse square law of intensity (i.e., the intensity ∝ 1/r^2) is valid for a (a) point source (b) line source

1 Answers 4 Views

Three observers A, B and C measure the speed of light coming from a source to be v_A, v_B and v_c. The observer A moves towards the source and C moves

1 Answers 5 Views

A parallel beam of light is incident on a converging lens parallel to its principal axis. As one moves away

1 Answers 5 Views

A light source emits monochromatic light of wavelength 555 nm. The source consumes 100 W of electric power

1 Answers 7 Views

Light from a point source falls on a screen. If the separation between the source and the screen is increased by 1%,

1 Answers 5 Views

What type of wavefront will emerge from a (i) point source, and (ii) distant light source?

1 Answers 4 Views

Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

The correct answer is

(c) I∝1/r³

5 views Answered 2023-02-05 15:29