(A) Given: Refractive index of water $(n)$ = $4/3 = 1.33$.Speed of light in vacuum $(c)$ = $3 \times 10^{8} \text{ m s}^{-1}$.We know the formula for

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$2.25 \times 10^{8} \text{ m s}^{-1}$

(A) Given: Refractive index of water $(n)$ = $4/3 = 1.33$.Speed of light in vacuum $(c)$ = $3 \times 10^{8} \text{ m s}^{-1}$.We know the formula for refractive index is $n = c / v$,where $v$ is the speed of light in the medium.Rearranging the formula to find $v$: $v = c / n$.Substituting the values: $v = (3 \times 10^{8}) / (4/3) = (3 \times 10^{8} \times 3) / 4 = 9 \times 10^{8} / 4 = 2.25 \times 10^{8} \text{ m s}^{-1}$.Therefore,the speed of light in water is $2.25 \times 10^{8} \text{ m s}^{-1}$.

Class 10 Science Light – Reflection and Refraction Mix Examples - Light – Reflection and Refraction

Medium

As the velocity of light increases,the refractive index of the medium decreases. Light enters from air to water having a refractive index of $4/3$. Find the speed of light in water. The speed of light in vacuum is $3 \times 10^{8} \text{ m s}^{-1}$.

A
$2.25 \times 10^{8} \text{ m s}^{-1}$
B
$2.00 \times 10^{8} \text{ m s}^{-1}$
C
$1.50 \times 10^{8} \text{ m s}^{-1}$
D
$3.00 \times 10^{8} \text{ m s}^{-1}$

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Light – Reflection and Refraction

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Mix Examples - Light – Reflection and Refraction

How many images are formed by two parallel mirrors?

Easy

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Which of the lenses with focal lengths $10 \, cm$,$20 \, cm$,$25 \, cm$,and $50 \, cm$ has the maximum power (in $, cm$)?

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$(a)$ Draw a ray diagram in each of the following cases to show the position and nature of the image formed when an object is placed:
$(i)$ Between the focus and the centre of curvature of a concave mirror.
$(ii)$ Between the focus and the pole of a concave mirror.
$(iii)$ Between the centre of curvature and infinity for a concave mirror.
$(b)$ Give mathematical formulae for determining the magnification produced by a spherical mirror. What does $m = -1$ signify? Identify the mirror that can produce it.

Medium

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What is the nature of the final image formed by an astronomical telescope compared to the object?

Easy

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What is the speed of light waves in a vacuum in units of $km/s$?

Easy

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As the velocity of light increases,the refractive index of the medium decreases. Light enters from air to water having a refractive index of $4/3$. Find the speed of light in water. The speed of light in vacuum is $3 \times 10^{8} \text{ m s}^{-1}$.

Similar Questions

How many images are formed by two parallel mirrors?

Which of the lenses with focal lengths $10 \, cm$,$20 \, cm$,$25 \, cm$,and $50 \, cm$ has the maximum power (in $, cm$)?

What is the nature of the final image formed by an astronomical telescope compared to the object?

What is the speed of light waves in a vacuum in units of $km/s$?

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