Which of the following electromagnetic wave has the longest wavelength?
radio-waves
gamma rays
infrared waves
ultraviolet rays
Correct answer is A
No explanation has been provided for this answer.
A lens that is thinner at the middle and thicher at the edges is
diverging
converging
plano-convex
converging meniscus
Correct answer is A
No explanation has been provided for this answer.
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.
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