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प्रश्न
Observe the figure and write accurate conclusion regarding refraction of light.
उत्तर
When a light ray passes from a rarer medium to a denser medium, it bends towards the normal.
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संबंधित प्रश्न
When a ray of light travels from air to glass slab and strikes the surface of separation at 90°, then it …………….
(a) bends towards normal
(b) bends away from normal
(c) passes unbent
(d) passes in zigzag way
Define refraction and state the laws of refraction.
State the dependence of angle of deviation On the wavelength of light
Write a relationship between the angle of incidence and angle of refractions for a given pair of media
Name one factor that affects the lateral displacement of light as it passes through a rectangular glass slab.
Draw the diagram given below and clearly show the path taken by the emergent ray.
A ray of light passes from water to air. How does the speed of light change?
Write the relation between the angle of incidence and the angle of refraction for a medium.
Draw diagrams to show the refraction of light from
- air to glass, and
- glass to air. In each diagram, label the incident ray, refracted ray, the angle of incidence
- and the angle of refraction (r).
In the adjacent diagram, AO is a ray of light incident on a rectangular glass slab.
- Complete the path of the ray till it emerges out of the slab.
- In the diagram, mark the angle of incidence (i) and the angle of refraction (r) at the first interface. How is the refractive index of glass related to the angles i and r?
- Mark angles of emergence by the letter e. How are the angles i and e related?
- Which two rays are parallel to each other? Name them.
- Indicate in the diagram the lateral displacement between the emergent ray and the incident ray. State one factor that affects the lateral displacement.
When a lighted candle is held in front of a thick plane glass mirror, several images can be seen, but the second image is the brightest, give reason.
When light travels from a rarer to a denser medium, its speed ______.
A light ray in passing from water to a medium
(a) speeds up
(b) slows down. In each case, give one example of the medium.
The diagram alongside shows the refraction of a ray of light from air to a liquid.
- Write the values of (i) angle of incidence, (ii) angle of refraction.
- Use Snell’s law to find the refractive index of liquid with respect to air.
Fill in the blanks to complete the following sentence
When light travels from a denser to a rarer medium, its speed ……………….
Name the colour of white light which is deviated the most on passing through a prism.
Complete Fig. 4.32 to show the path of the ray of single colour as it enters the prism and emerges out of it. Mark the angles wherever necessary.
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 XX' called?
(iii) Complete the ray diagram and show the path of the incident ray PQ after passing through the lens.
(iv) The final emergent ray will either meet XX' at a point or appear to come from a point on XX'. what is the point called?
A ray of light strikes the surface at a rectangular glass slab such that the angle of incidence is 45o.
In each case, draw diagram to show the path taken by the ray as it passes through the glass slab and emerges from it.
Using the curve, how do you infer that for given prism, the angle of minimum deviation δmin is unique for the given light?
Name the phenomenon responsible in the following case:
Twinkling of stars
Why does a fisherman aim at the tail of fish during spearfishing?
Why upper surface of water contained in a beaker and above eye level appears silvery?
Why is the colour red used as a sign of danger?
Does the depth of a tank of water appear to change or remain the same when viewed normally from above?
State the relation between the refractive index μ and the velocity of light (vm) in that medium.
Can the absolute refractive index of a medium be less than one?
In the diagram below, PQ is a ray of light incident on a rectangular glass block.
Copy the diagram and complete the path of the ray of light through the glass block. In your diagram, mark the angle of incidence by letter ‘i’ and the angle of emergence by the letter ‘e’.
The figure shows two prisms A and B. A monochromatic ray of light PO is incident at the face of the prism A. Complete the diagram to show the path of the ray till it emerges out of the prism B.
The diagram shows the path of a ray of light through a rectangular glass block placed in a liquid of uniform density.
What is the angular, deviation of the emergent ray from the glass block with respect to the incident ray?
Write the approximate values of speed of light in (i) air and (ii) glass. Use these values to calculate the refractive index of glass with respect to air.
The refractive index of glass with respect to air is 1.5. What is the value of the refractive index of air with respect to glass?
