Question

please fast answers me
please brothers and sisters ​

Answer 1

$\large\underline{\pmb{\sf Answer_{(1)}:- }}$

• A ray of light traveling obliquely from air to water bends towards the normal. This is because air is a rarer medium and water is a denser medium. Ray of light bends towards the normal while traveling from rarer to denser medium.

$\large\underline{\pmb{\sf Answer_{(2)}:- }}$

• In the question, we are provided with a refractive index of a glass which is 1.5. Also, we are given that speed of light in vacuum is 3×$10^8$
• we are asked to find the speed of light in glass. So, we can use the following formula to find the answer:-

$\longrightarrow$$\underline{\boxed{\sf Refractive\:index_ {n_{a}}=\dfrac{speed\:of\:light\:in\:vacuum{_{(c)}}}{speed\:of\:light\:in\:medium_{(v)} }}}$

$:\implies\sf 1.5=\dfrac{3×10^8}{v}$

$:\implies\sf v=2×10^8m/s$

$\large\underline{\pmb{\sf Answer_{(3)}:- }}$

• you haven't given the table but it's okay just look at the table and the one which has the maximum refractive index will most optically denser and the one with the least refractive index will be the least optically denser.

$\large\underline{\pmb{\sf Answer_{(4)}:- }}$

• For this question, look at the given table and see which medium has a refractive index. That medium will be optically rarer and the speed of light is the fastest in the rarer medium.

$\large\underline{\pmb{\sf Answer_{(5)}:- }}$

• This statement means that Diamond can lower the speed of light up to  2.42 times as compared to its speed in vacuum/air.

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I hope it's beneficial :D