Question

The radii of curvature of a glass convex lens is 7.5cm are 5cm and 15 cm.Then refractive index of glass is?[Answer needed with working or would be marked spam , if answer right i mark brainliest and 99 points give away and 4 options given are:]
4/3
3/2
5/4
5/3

Answer 1

hey!!!

We will solve this problem using the lens maker formula which can be by two methods. They are the following:-

♣ 1st method: 1/f=(n-1)×(1/R1-1/R2+(n-1)×d/(n×R1×R2))

♣ 2nd method: 1/f=(n-1)×(1/R1+1/R2))

I recommend you to use the 2nd method. It's much more convenient. Answer is coming by my method. Correct answer is 5/3. Hope it helps!!!... Please mark my answer as brainliest!!!... And don't forget to follow me!!!...

Answer 2

HEY MATE HERE IS YOUR ANSWER

$<big>Answer :-</big>$

OPTION. D

5/3

You can answer by two methods :-

Method 1. $<b>➡️1/f =(n-1) × (1/R1 - 1/R2+n-1) ×d/(n ×R1 × R2) </b>$

Method 2.$<b> 1/f =(n-1) × (1/R1 + 1/R2))</b>$




Hope it will help you

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