Page 527 - SUBSEC October 2017_Neat

UNIT 1
MODULE 2: OSCILLATIONS AND WAVES (cont’d)

SPECIFIC OBJECTIVES EXPLANATORY NOTES SUGGESTED PRACTICAL
ACTIVITIES

Physics of the Ear and Eye (cont’d)

Students should be able to:

3.3. use the equation intensity I = intensity
level in dB =10 ( ⁄ ); I0 = threshold intensity
10
0
dBA scale
3.4. discuss the subjective
qualities of the terms
‘noise’ and ‘loudness’;

3.5. solve problems using lens 1 + 1 1 Determine the focal length
formulae; = of a lens.

Power in dioptres = ,
1

with f in metres.

3.6. discuss how the eye forms
focused images of objects
at different distances;

3.7. explain the terms: Calculations on power of Investigate depth of focus
correcting lens required. by applying the lens
(a) depth of focus; formulae by keeping one
constant and varying the
(b) accommodation; other.

(c) long sight;

(d) short sight;

(e) astigmatism; and,

(f) cataracts;

3.8. discuss how defects of the
eye can be corrected; and,

3.9. discuss the formation of
focused images in the
simple camera and
magnifying glass.

CXC A16/U2/17 27