Question

To find the refractive index of liquid using convex lens and plane mirror

Answer 1

Explanation:

Take any one convex lens and find its rough focal length. Take a plane mirror and place it on the horizontal base of the iron stand. Place the convex lens on the plane mirror. Screw tight the optical needle in the clamp of the stand and hold it horizontally above the lens at distance equal to its rough focal length

Answer 2

Calculation of refractive index

Explanation:

step for calculating the refractive index is given below

1)  paced plane mirror with reflecting surface pointing upward on retort stand.

2) Now placed given convex lens over already adjusted plane mirror

3) Adjust the pointer horizontally on clamp and vertically above the convex lens in a such a way the inverted image of pointer is observed

4) Without having parallax error, adjust height of stand such that pointer coincide with image

5) the distance between the top and bottom of obtained image is noticed, hence focal length F is calculated which is the average of both distance.

Refractive index then calculate by using following formula

$n_1 = 1+ \frac{R}{f_2}$

where R is radius of curvature

$R = \frac{f_1 d}{f_1 -d}$

where d is distance between pointer and center lens

$f_2$ is foacl length of liquid lense

$f_2 =\frac{Ff_1}{f_1 -F}$

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