alleryLight: air λ=600 nm, c=3×10^8; glass speed=2×10^8 m/s, frequency unchanged. Glass λ?
A900 nm
B300 nm
C400 nm
D600 nm
Answer & Solution
Correct answer: C. 400 nm
The air frequency is 5×10^14 Hz and remains unchanged, so the glass wavelength is 2×10^8/(5×10^14)=400 nm.
Keep practising Ray Optics and Optical Instruments
Browse all Ray Optics and Optical Instruments questions for ICSE Class 10, or explore more Physics topics.
Related questions
Prism A=60°, incidence 40°, deviation 30°. Reverse the path. New incidence?Normal entry: 30° prism in air, n=1.5. Given sin^-1(0.75)=48.6°. Deviation?In vacuum, infrared λ=1 μm and UV λ=0.25 μm. Which frequency is greater?Vacuum radiation f=10^15 Hz; c=3×10^8 m/s. Which wavelength and band fit?A water-air ray is 35° to the surface. Critical angle=48°. What follows?Glass n=1.5, sin i=0.8. Outside is air n=1 or water n=4/3. TIR occurs withNormal entry into a 30° prism in air, n=1.5. At its next face, sin emergence isAt an interface sin i/sin r=1.5; speed in medium 1 is 2.4×10^8 m/s. Speed in 2?