A point source emits light isotropically (i.e. with the same intensity in all directions). Let I be the luminous intensity at a distance d from the source. The intensity at a distance 2d is equal to: 4O A. I В. 1/4 OC.I/2 O D.I/16 O E. 21

A point source emits light isotropically (i.e. with the same intensity in all directions). Let I be the luminous intensity at a distance d from the source. The intensity at a distance 2d is equal to: 4O A. I В. 1/4 OC.I/2 O D.I/16 O E. 21

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter16: Fundamentals Of Light

Section: Chapter Questions

Problem 3STP

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Concept explainers

Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.

Question

A point source emits light isotropically (i.e. with the same intensity in all
directions). Let I be the luminous intensity at a distance d from the source.
The intensity at a distance 2d is equal to:
4O A. I
В. 1/4
OC.I/2
O D.I/16
O E. 21

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