Light travels through air at 300 million $ms ^{-1}$. On entering water it slows down to 225 million $ms ^{-1}$. Calculate the refractive index of water.
Download our app for free and get started
Speed of light in air = 300 million $ms ^{-1}$ Speed of light in water = 225 million $ms ^{-1}$ We know that,$\text{Refractive index of water}=\frac{\text{Speed of light in air}}{\text{Speed of light in water}}$
$\text{Refractive index of water}=\frac{300\text{ million m}/ \text{ s}}{225\text{million m}/\text{s}}=1.33$
$\text{Refractive index of water}=\frac{300\text{ million m}/ \text{ s}}{225\text{million m}/\text{s}}=1.33$
Download our appand get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Similar Questions
- 1View SolutionA lens has power 4D. Find the focal length that lens.
- 2View SolutionWhen a fork is seen through lenses A and B one by one, it appears as shown in the diagrams. What is the nature of (i) lens A, and (ii) lens B? Give reason for your answer.
- 3View SolutionAn object of height 4.0cm is placed at a distance of 30cm from the optical centre ‘O’ of a convex lens of focal length 20cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre ‘O’ and principal focus ‘F’ on the diagram. Also find the approximate ratio of size of the image to the size of the object.
- 4View SolutionRefractive indices of four media A, B, C and D are given below:
In which of these four media is the speed of light:MediumRefractive indexABCD1.331.441.521.65- Maximum, and
- Minimum?
- 5View SolutionA communications satellite in orbit sends a parallel beam of signals down to earth. If these signals obey the same laws of reflection as light and are to be focussed onto a small receiving aerial, what should be the best shape of the metal 'dish' used to collect them?
- 6View SolutionLight travels more quickly through water than through glass:
- Which is optically denser: Water or glass?
- If a ray of light passes from glass into water, which way will it bend: Towards the normal or away from the normal?
- 7View SolutionShow by drawing a ray-diagram that the image of an object formed by a concave lens is virtual, erect and diminished.
- 8View SolutionA student focuses the image of a candle flame, placed at about 2 m from a convex lens of focal length 10 cm, on a screen. After that he moves gradually the flame towards the lens and each time focuses its image on the screen.
- In which direction does he move the lens to focus the flame on the screen?
- What happens to the size of the image of the flame formed on the screen?
- What difference is seen in the intensity (brightness) of the image of the flame on the screen?
- What is seen on the screen when the flame is very close (at about 5 cm) to the lens?
- 9View SolutionAn object lies at a distance of 2f from a concave lens of focal length f. Draw a ray-diagram to illustrate the image formation.
- 10View SolutionState two factors on which the lateral displacement of the emergent ray depends.