Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
A ray of light travels from air to water. The refeactive index of water is given by the expression
\(\frac{\text{velocity in water}}{\text{velocity in air}}\)
\(\frac{\text{sine of angle of refraction}}{\text{sine of angle of incidence}}\)
\(\frac{\text{apparent depth}}{\text{real depth }}\)
\(\frac{\text{wavelength in air}}{\text{wavelength in water}}\)
Correct answer is D
No explanation has been provided for this answer.
From the diagram, the correct equation for the refractive index n of the medium is
n = tan i
n = \(\frac{sin i}{sin 90^o}\)
n = \(\frac{sin i}{cos (90^o - i)}\)
n = sin 90oC
Correct answer is A
refractive index(n) = \(\frac{sin i}{sinr}\)
where r = 180-(90+i) → r=90-i
since sin(90-i)=cos i
: refractive index(n) = \(\frac{sin i}{cos i}\)
→ tan i
between principal focus and pole
between principal focus and centre of curvature
at infinity
at centre of curvature
Correct answer is C
No explanation has been provided for this answer.
The following devices use plane mirrors in their operations, except
periscope
sextant
kaleidoscope
binoculars
Correct answer is D
No explanation has been provided for this answer.
The ability of a wave to spread around corners is called
polarisation
dispersion
diffraction
reflection
Correct answer is C
No explanation has been provided for this answer.