Advertisements
Advertisements
प्रश्न
Trace a ray of light incident at 30° on a surface if travelling from glass to air. What is the angle of refraction in this case? (R.I. for glass = 3/2).
Advertisements
उत्तर
For a ray of light from glass to air R.I. is denoted as gμa.
`""_"g"mu_"a"=1/(""_"a"mu_"g")`
∴ `sin"i"/sin"r′"=1/(""_"a"mu_"g")`
sin r′ = aμg × sin i
and aμg = `3/2`
∴ sin r′ = `3/2xx1/2`
= `3/4`
= 0.7500
∴ r′ = 48°36′
Angle of refraction for glass to air = 48°36′.
संबंधित प्रश्न
A student very cautiously traces the path of a ray through a glass slab for different values of the angle of incidence (∠i). He then measures the corresponding values of the angle of refraction (∠r) and the angle of emergence (∠e) for every value of the angle of incidence. On analysing these measurements of angles, his conclusion would be
(A) ∠i > ∠r > ∠e
(B) ∠i = ∠e > ∠r
(C) ∠i < ∠r < ∠e
(D) ∠i = ∠e < ∠r
Name the colour of white light which is deviated the most on passing through a prism.
A coin is places at the bottom of a beaker containing water (refractive index = 4/3) to a depth of 12 cm. By what height the coin appears to be raised when seen from vertically above?
A postage stamp kept below a rectangular glass block of refractive index 1.5 when viewed from vertically above it, appears to be raised by 7.0 mm. Calculate the thickness of the glass slab.
The critical angle for glass-air is 45° for the light of yellow colour. State whether it will be less than, equal to, or more than 45° for (i) ref light, (ii) blue light?
Fig shows a lens as a combination of a glass block and two prisms.
(i) Name the lens formed by the combination.
(ii) What is the line XX' called?
(iii) Complete the path of the incident ray PQ after passing through the lens.
(iv) The final emergent ray either meets XX' at a point or appears to come from a point on XX'. Label it as F, What is this point called?
How does the deviation produced by a prism depend on the refraction index of its material.
What is the refractive index of vacuum
The diagram shows the path of a ray of light through a rectangular glass block placed in a liquid of uniform density.
Show with the help of a ray diagram the path of the ray when incident ray normally falls on the first surface of the glass block and passes through the block and the liquid.
Explain with the help of a diagram of how fish is able to see the objects above it.
